[occt.git] / src / STEPCAFControl / STEPCAFControl_Reader.cxx

// Created on: 2000-08-15
// Created by: Andrey BETENEV
// Copyright (c) 2000-2014 OPEN CASCADE SAS
//
// This file is part of Open CASCADE Technology software library.
//
// This library is free software; you can redistribute it and/or modify it under
// the terms of the GNU Lesser General Public License version 2.1 as published
// by the Free Software Foundation, with special exception defined in the file
// OCCT_LGPL_EXCEPTION.txt. Consult the file LICENSE_LGPL_21.txt included in OCCT
// distribution for complete text of the license and disclaimer of any warranty.
//
// Alternatively, this file may be used under the terms of Open CASCADE
// commercial license or contractual agreement.


#include <BRep_Builder.hxx>
#include <Geom_Axis2Placement.hxx>
#include <Geom_CartesianPoint.hxx>
#include <Geom_Plane.hxx>
#include <Interface_EntityIterator.hxx>
#include <Interface_InterfaceModel.hxx>
#include <StepData_StepModel.hxx>
#include <HeaderSection_FileSchema.hxx>
#include <Interface_Static.hxx>
#include <NCollection_DataMap.hxx>
#include <OSD_Path.hxx>
#include <Quantity_Color.hxx>
#include <Quantity_ColorRGBA.hxx>
#include <StepAP214_AppliedExternalIdentificationAssignment.hxx>
#include <StepBasic_ConversionBasedUnitAndLengthUnit.hxx>
#include <StepBasic_ConversionBasedUnitAndPlaneAngleUnit.hxx>
#include <StepBasic_ConversionBasedUnitAndMassUnit.hxx>
#include <StepBasic_DerivedUnit.hxx>
#include <StepBasic_DerivedUnitElement.hxx>
#include <StepBasic_MeasureValueMember.hxx>
#include <StepBasic_MeasureWithUnit.hxx>
#include <StepBasic_NamedUnit.hxx>
#include <StepBasic_Product.hxx>
#include <StepBasic_ProductDefinition.hxx>
#include <StepBasic_ProductDefinitionFormation.hxx>
#include <StepBasic_ProductDefinitionRelationship.hxx>
#include <StepBasic_ProductDefinitionWithAssociatedDocuments.hxx>
#include <StepBasic_SiUnit.hxx>
#include <StepBasic_SiUnitAndLengthUnit.hxx>
#include <StepBasic_Unit.hxx>
#include <STEPCAFControl_Controller.hxx>
#include <STEPCAFControl_DataMapIteratorOfDataMapOfShapePD.hxx>
#include <STEPCAFControl_DataMapOfPDExternFile.hxx>
#include <STEPCAFControl_DataMapOfSDRExternFile.hxx>
#include <STEPCAFControl_DataMapOfShapePD.hxx>
#include <STEPCAFControl_ExternFile.hxx>
#include <STEPCAFControl_Reader.hxx>
#include <STEPConstruct.hxx>
#include <STEPConstruct_Assembly.hxx>
#include <STEPConstruct_ExternRefs.hxx>
#include <STEPConstruct_Styles.hxx>
#include <STEPConstruct_Tool.hxx>
#include <STEPConstruct_UnitContext.hxx>
#include <STEPConstruct_ValidationProps.hxx>
#include <STEPControl_ActorRead.hxx>
#include <STEPControl_Reader.hxx>
#include <StepGeom_GeometricRepresentationItem.hxx>
#include <StepGeom_Axis2Placement3d.hxx>
#include <StepGeom_Direction.hxx>
#include <StepDimTol_AngularityTolerance.hxx>
#include <StepDimTol_CircularRunoutTolerance.hxx>
#include <StepDimTol_CoaxialityTolerance.hxx>
#include <StepDimTol_ConcentricityTolerance.hxx>
#include <StepDimTol_CylindricityTolerance.hxx>
#include <StepDimTol_Datum.hxx>
#include <StepDimTol_DatumFeature.hxx>
#include <StepDimTol_DatumReference.hxx>
#include <StepDimTol_DatumReferenceElement.hxx>
#include <StepDimTol_DatumReferenceCompartment.hxx>
#include <StepDimTol_DatumSystem.hxx>
#include <StepDimTol_FlatnessTolerance.hxx>
#include <StepDimTol_GeometricTolerance.hxx>
#include <StepDimTol_GeometricToleranceWithDatumReference.hxx>
#include <StepDimTol_GeoTolAndGeoTolWthDatRefAndModGeoTolAndPosTol.hxx>
#include <StepDimTol_GeoTolAndGeoTolWthDatRef.hxx>
#include <StepDimTol_GeoTolAndGeoTolWthDatRefAndGeoTolWthMaxTol.hxx>
#include <StepDimTol_GeoTolAndGeoTolWthDatRefAndUneqDisGeoTol.hxx>
#include <StepDimTol_GeoTolAndGeoTolWthMaxTol.hxx>
#include <StepDimTol_HArray1OfDatumReference.hxx>
#include <StepDimTol_LineProfileTolerance.hxx>
#include <StepDimTol_ModifiedGeometricTolerance.hxx>
#include <StepDimTol_ParallelismTolerance.hxx>
#include <StepDimTol_PerpendicularityTolerance.hxx>
#include <StepDimTol_PositionTolerance.hxx>
#include <StepDimTol_ProjectedZoneDefinition.hxx>
#include <StepDimTol_RoundnessTolerance.hxx>
#include <StepDimTol_RunoutZoneDefinition.hxx>
#include <StepDimTol_StraightnessTolerance.hxx>
#include <StepDimTol_SurfaceProfileTolerance.hxx>
#include <StepDimTol_SymmetryTolerance.hxx>
#include <StepDimTol_ToleranceZone.hxx>
#include <StepDimTol_ToleranceZoneForm.hxx>
#include <StepDimTol_TotalRunoutTolerance.hxx>
#include <StepDimTol_GeometricToleranceWithModifiers.hxx>
#include <StepDimTol_HArray1OfGeometricToleranceModifier.hxx>
#include <StepDimTol_GeoTolAndGeoTolWthDatRefAndGeoTolWthMod.hxx>
#include <StepDimTol_GeoTolAndGeoTolWthMod.hxx>
#include <StepDimTol_GeometricToleranceWithMaximumTolerance.hxx>
#include <StepGeom_Axis2Placement3d.hxx>
#include <StepGeom_GeometricRepresentationContextAndGlobalUnitAssignedContext.hxx>
#include <StepGeom_GeomRepContextAndGlobUnitAssCtxAndGlobUncertaintyAssCtx.hxx>
#include <StepGeom_Plane.hxx>
#include <StepGeom_Polyline.hxx>
#include <StepDimTol_PlacedDatumTargetFeature.hxx>
#include <StepRepr_AssemblyComponentUsage.hxx>
#include <StepRepr_CharacterizedDefinition.hxx>
#include <StepRepr_CompoundRepresentationItem.hxx>
#include <StepRepr_DerivedShapeAspect.hxx>
#include <StepRepr_DescriptiveRepresentationItem.hxx>
#include <StepRepr_HArray1OfRepresentationItem.hxx>
#include <StepRepr_MappedItem.hxx>
#include <StepRepr_MeasureRepresentationItem.hxx>
#include <StepRepr_NextAssemblyUsageOccurrence.hxx>
#include <StepRepr_ProductDefinitionShape.hxx>
#include <StepRepr_PropertyDefinition.hxx>
#include <StepRepr_PropertyDefinitionRepresentation.hxx>
#include <StepRepr_Representation.hxx>
#include <StepRepr_RepresentationItem.hxx>
#include <StepRepr_HArray1OfRepresentationItem.hxx>
#include <StepRepr_RepresentationMap.hxx>
#include <StepRepr_RepresentationRelationship.hxx>
#include <StepRepr_RepresentedDefinition.hxx>
#include <StepRepr_ReprItemAndLengthMeasureWithUnit.hxx>
#include <StepRepr_ReprItemAndLengthMeasureWithUnitAndQRI.hxx>
#include <StepRepr_ReprItemAndPlaneAngleMeasureWithUnit.hxx>
#include <StepRepr_ReprItemAndPlaneAngleMeasureWithUnitAndQRI.hxx>
#include <StepRepr_SequenceOfRepresentationItem.hxx>
#include <StepRepr_ShapeAspect.hxx>
#include <StepRepr_ShapeAspectDerivingRelationship.hxx>
#include <StepRepr_CompositeShapeAspect.hxx>
#include <StepRepr_AllAroundShapeAspect.hxx>
#include <StepRepr_CompShAspAndDatumFeatAndShAsp.hxx>
#include <StepRepr_ShapeAspectRelationship.hxx>
#include <StepRepr_ShapeRepresentationRelationship.hxx>
#include <StepRepr_SpecifiedHigherUsageOccurrence.hxx>
#include <StepRepr_ValueRange.hxx>
#include <StepRepr_FeatureForDatumTargetRelationship.hxx>
#include <StepShape_AdvancedFace.hxx>
#include <StepShape_AdvancedBrepShapeRepresentation.hxx>
#include <StepShape_AngleRelator.hxx>
#include <StepShape_AngularSize.hxx>
#include <StepShape_AngularLocation.hxx>
#include <StepShape_ClosedShell.hxx>
#include <StepShape_ConnectedFaceSet.hxx>
#include <StepShape_ContextDependentShapeRepresentation.hxx>
#include <StepRepr_CompGroupShAspAndCompShAspAndDatumFeatAndShAsp.hxx>
#include <StepRepr_CompShAspAndDatumFeatAndShAsp.hxx>
#include <StepShape_DimensionalCharacteristicRepresentation.hxx>
#include <StepShape_DimensionalSizeWithPath.hxx>
#include <StepShape_DimensionalLocationWithPath.hxx>
#include <StepShape_ShapeDimensionRepresentationItem.hxx>
#include <StepShape_ShapeRepresentationWithParameters.hxx>
#include <StepShape_HArray1OfShapeDimensionRepresentationItem.hxx>
#include <StepShape_DimensionalSize.hxx>
#include <StepShape_DimensionalLocation.hxx>
#include <StepShape_EdgeCurve.hxx>
#include <StepShape_EdgeLoop.hxx>
#include <StepShape_GeometricCurveSet.hxx>
#include <StepShape_GeometricSet.hxx>
#include <StepShape_HArray1OfFace.hxx>
#include <StepShape_HArray1OfFaceBound.hxx>
#include <StepShape_HArray1OfOrientedEdge.hxx>
#include <StepShape_HArray1OfShell.hxx>
#include <StepShape_LimitsAndFits.hxx>
#include <StepShape_Loop.hxx>
#include <StepShape_ManifoldSolidBrep.hxx>
#include <StepShape_PlusMinusTolerance.hxx>
#include <StepShape_QualifiedRepresentationItem.hxx>
#include <StepShape_OpenShell.hxx>
#include <StepShape_ShapeDefinitionRepresentation.hxx>
#include <StepShape_ShapeDimensionRepresentation.hxx>
#include <StepShape_ShapeRepresentation.hxx>
#include <StepShape_ShellBasedSurfaceModel.hxx>
#include <StepShape_SolidModel.hxx>
#include <StepShape_ToleranceMethodDefinition.hxx>
#include <StepShape_ToleranceValue.hxx>
#include <StepShape_ValueFormatTypeQualifier.hxx>
#include <StepShape_Vertex.hxx>
#include <StepToGeom.hxx>
#include <StepVisual_AnnotationCurveOccurrence.hxx>
#include <StepVisual_AnnotationFillArea.hxx>
#include <StepVisual_AnnotationPlane.hxx>
#include <StepVisual_CameraModelD3.hxx>
#include <StepVisual_CameraModelD3MultiClipping.hxx>
#include <StepVisual_CameraModelD3MultiClippingIntersection.hxx>
#include <StepVisual_CameraModelD3MultiClippingUnion.hxx>
#include <StepVisual_CoordinatesList.hxx>
#include <StepVisual_HArray1OfCameraModelD3MultiClippingInterectionSelect.hxx>
#include <StepVisual_HArray1OfCameraModelD3MultiClippingUnionSelect.hxx>
#include <StepVisual_DraughtingCallout.hxx>
#include <StepVisual_DraughtingCalloutElement.hxx>
#include <StepVisual_DraughtingModel.hxx>
#include <StepVisual_Invisibility.hxx>
#include <StepVisual_LayeredItem.hxx>
#include <StepVisual_PlanarBox.hxx>
#include <StepVisual_PresentationLayerAssignment.hxx>
#include <StepVisual_PresentationStyleByContext.hxx>
#include <StepVisual_StyleContextSelect.hxx>
#include <StepVisual_StyledItem.hxx>
#include <StepVisual_ViewVolume.hxx>
#include <StepShape_TypeQualifier.hxx>
#include <TCollection_AsciiString.hxx>
#include <TCollection_HAsciiString.hxx>
#include <TColStd_HArray1OfReal.hxx>
#include <TColStd_HArray1OfTransient.hxx>
#include <TColStd_HSequenceOfTransient.hxx>
#include <TColStd_IndexedDataMapOfTransientTransient.hxx>
#include <TColStd_MapIteratorOfMapOfTransient.hxx>
#include <TColStd_MapOfTransient.hxx>
#include <TColStd_SequenceOfHAsciiString.hxx>
#include <TDataStd_Name.hxx>
#include <TDataStd_TreeNode.hxx>
#include <TDataStd_UAttribute.hxx>
#include <TDF_Label.hxx>
#include <TDF_Tool.hxx>
#include <TDocStd_Document.hxx>
#include <TNaming_NamedShape.hxx>
#include <TopExp_Explorer.hxx>
#include <TopoDS.hxx>
#include <TopoDS_Compound.hxx>
#include <TopoDS_Iterator.hxx>
#include <TopoDS_Shape.hxx>
#include <TopTools_ListIteratorOfListOfShape.hxx>
#include <TopTools_ListOfShape.hxx>
#include <TopTools_MapOfShape.hxx>
#include <Transfer_Binder.hxx>
#include <Transfer_TransientProcess.hxx>
#include <TransferBRep.hxx>
#include <UnitsMethods.hxx>
#include <XCAFDoc.hxx>
#include <XCAFDoc_Area.hxx>
#include <XCAFDoc_Centroid.hxx>
#include <XCAFDoc_ClippingPlaneTool.hxx>
#include <XCAFDoc_ColorTool.hxx>
#include <XCAFDoc_DataMapOfShapeLabel.hxx>
#include <XCAFDoc_DimTolTool.hxx>
#include <XCAFDoc_Dimension.hxx>
#include <XCAFDoc_Datum.hxx>
#include <XCAFDoc_GeomTolerance.hxx>
#include <XCAFDoc_DocumentTool.hxx>
#include <XCAFDoc_GraphNode.hxx>
#include <XCAFDoc_LayerTool.hxx>
#include <XCAFDoc_MaterialTool.hxx>
#include <XCAFDoc_ShapeTool.hxx>
#include <XCAFDoc_View.hxx>
#include <XCAFDoc_ViewTool.hxx>
#include <XCAFDoc_Volume.hxx>
#include <XCAFDimTolObjects_DimensionModifiersSequence.hxx>
#include <XCAFDimTolObjects_GeomToleranceType.hxx>
#include <XCAFDimTolObjects_DimensionObject.hxx>
#include <XCAFDimTolObjects_GeomToleranceObject.hxx>
#include <XCAFDimTolObjects_DatumObject.hxx>
#include <XCAFView_Object.hxx>
#include <XSAlgo.hxx>
#include <XSAlgo_AlgoContainer.hxx>
#include <XSControl_TransferReader.hxx>
#include <XSControl_WorkSession.hxx>
#include <StepAP242_DraughtingModelItemAssociation.hxx>
#include <StepAP242_GeometricItemSpecificUsage.hxx>
#include <StepGeom_CartesianPoint.hxx>
#include <STEPCAFControl_GDTProperty.hxx>
#include <StepVisual_TessellatedAnnotationOccurrence.hxx>
#include <StepVisual_TessellatedAnnotationOccurrence.hxx>
#include <StepVisual_TessellatedItem.hxx>
#include <StepVisual_TessellatedGeometricSet.hxx>
#include <StepVisual_TessellatedCurveSet.hxx>
#include <StepVisual_CoordinatesList.hxx>
#include <NCollection_Vector.hxx>

#include <TColgp_HArray1OfXYZ.hxx>
#include <BRepBuilderAPI_MakeEdge.hxx>
#include <BRepTools.hxx>
#include <Transfer_ActorOfTransientProcess.hxx>
#include <Bnd_Box.hxx>
#include <BRepBndLib.hxx>
#include <Resource_Unicode.hxx>

// skl 21.08.2003 for reading G&DT
//#include <StepRepr_CompoundItemDefinition.hxx>
//#include <StepRepr_CompoundItemDefinitionMember.hxx>
//#include <StepBasic_ConversionBasedUnit.hxx>
//#include <TDataStd_Real.hxx>
//#include <TDataStd_Constraint.hxx>
//#include <TDataStd_ConstraintEnum.hxx>
//#include <TNaming_Tool.hxx>
//#include <AIS_InteractiveObject.hxx>
//#include <TPrsStd_ConstraintTools.hxx>
//#include <AIS_DiameterDimension.hxx>
//#include <TPrsStd_Position.hxx>
//#include <TPrsStd_AISPresentation.hxx>
//#include <TNaming_Builder.hxx>
#ifdef OCCT_DEBUG
//! Converts address of the passed shape (TShape) to string.
//! \param theShape [in] Shape to dump.
//! \return corresponding string.
TCollection_AsciiString AddrToString(const TopoDS_Shape& theShape)
{
  std::string anAddrStr;
  std::ostringstream ost;
  ost << theShape.TShape().get();
  anAddrStr = ost.str();

  TCollection_AsciiString aStr =
    TCollection_AsciiString("[").Cat(anAddrStr.c_str()).Cat("]");

  return aStr;
}
#endif

//=======================================================================
//function : STEPCAFControl_Reader
//purpose  : 
//=======================================================================

STEPCAFControl_Reader::STEPCAFControl_Reader()
: mySourceCodePage (Resource_FormatType_UTF8),
  myColorMode(Standard_True),
  myNameMode(Standard_True),
  myLayerMode(Standard_True),
  myPropsMode(Standard_True),
  mySHUOMode(Standard_False),
  myGDTMode(Standard_True),
  myMatMode(Standard_True),
  myViewMode(Standard_True)
{
  STEPCAFControl_Controller::Init();
  mySourceCodePage = (Resource_FormatType )Interface_Static::IVal ("read.stepcaf.codepage");
}


//=======================================================================
//function : STEPCAFControl_Reader
//purpose  : 
//=======================================================================

STEPCAFControl_Reader::STEPCAFControl_Reader(const Handle(XSControl_WorkSession)& WS,
  const Standard_Boolean scratch)
: mySourceCodePage (Resource_FormatType_UTF8),
  myColorMode(Standard_True),
  myNameMode(Standard_True),
  myLayerMode(Standard_True),
  myPropsMode(Standard_True),
  mySHUOMode(Standard_False),
  myGDTMode(Standard_True),
  myMatMode(Standard_True),
  myViewMode(Standard_True)
{
  STEPCAFControl_Controller::Init();
  mySourceCodePage = (Resource_FormatType )Interface_Static::IVal ("read.stepcaf.codepage");
  Init(WS, scratch);
}


//=======================================================================
//function : Init
//purpose  : 
//=======================================================================

void STEPCAFControl_Reader::Init(const Handle(XSControl_WorkSession)& WS,
  const Standard_Boolean scratch)
{
  // necessary only in Writer, to set good actor:  WS->SelectNorm ( "STEP" );
  myReader.SetWS(WS, scratch);
  myFiles.Clear();
}

//=======================================================================
//function : convertName
//purpose  :
//=======================================================================
TCollection_ExtendedString STEPCAFControl_Reader::convertName (const TCollection_AsciiString& theName) const
{
  TCollection_ExtendedString aName;
  Resource_Unicode::ConvertFormatToUnicode (mySourceCodePage, theName.ToCString(), aName);
  return aName;
}

//=======================================================================
//function : ReadFile
//purpose  : 
//=======================================================================

IFSelect_ReturnStatus STEPCAFControl_Reader::ReadFile(const Standard_CString filename)
{
  return myReader.ReadFile(filename);
}


//=======================================================================
//function : NbRootsForTransfer
//purpose  : 
//=======================================================================

Standard_Integer STEPCAFControl_Reader::NbRootsForTransfer()
{
  return myReader.NbRootsForTransfer();
}


//=======================================================================
//function : TransferOneRoot
//purpose  : 
//=======================================================================

Standard_Boolean STEPCAFControl_Reader::TransferOneRoot(const Standard_Integer num,
  Handle(TDocStd_Document) &doc)
{
  TDF_LabelSequence Lseq;
  return Transfer(myReader, num, doc, Lseq);
}


//=======================================================================
//function : Transfer
//purpose  : 
//=======================================================================

Standard_Boolean STEPCAFControl_Reader::Transfer(Handle(TDocStd_Document) &doc)
{
  TDF_LabelSequence Lseq;
  return Transfer(myReader, 0, doc, Lseq);
}


//=======================================================================
//function : Perform
//purpose  : 
//=======================================================================

Standard_Boolean STEPCAFControl_Reader::Perform(const Standard_CString filename,
  Handle(TDocStd_Document) &doc)
{
  if (ReadFile(filename) != IFSelect_RetDone) return Standard_False;
  return Transfer(doc);
}


//=======================================================================
//function : Perform
//purpose  : 
//=======================================================================

Standard_Boolean STEPCAFControl_Reader::Perform(const TCollection_AsciiString &filename,
  Handle(TDocStd_Document) &doc)
{
  if (ReadFile(filename.ToCString()) != IFSelect_RetDone) return Standard_False;
  return Transfer(doc);
}


//=======================================================================
//function : ExternFiles
//purpose  : 
//=======================================================================

const   NCollection_DataMap<TCollection_AsciiString, Handle(STEPCAFControl_ExternFile)>& STEPCAFControl_Reader::ExternFiles() const
{
  return myFiles;
}


//=======================================================================
//function : ExternFile
//purpose  : 
//=======================================================================

Standard_Boolean STEPCAFControl_Reader::ExternFile(const Standard_CString name,
  Handle(STEPCAFControl_ExternFile) &ef) const
{
  ef.Nullify();
  if (myFiles.IsEmpty() || !myFiles.IsBound(name))
    return Standard_False;
  ef = myFiles.Find(name);
  return Standard_True;
}


//=======================================================================
//function : Reader
//purpose  : 
//=======================================================================

STEPControl_Reader &STEPCAFControl_Reader::ChangeReader()
{
  return myReader;
}


//=======================================================================
//function : Reader
//purpose  : 
//=======================================================================

const STEPControl_Reader &STEPCAFControl_Reader::Reader() const
{
  return myReader;
}


//=======================================================================
//function : FillShapesMap
//purpose  : auxiliary: fill a map by all compounds and their components
//=======================================================================

static void FillShapesMap(const TopoDS_Shape &S, TopTools_MapOfShape &map)
{
  TopoDS_Shape S0 = S;
  TopLoc_Location loc;
  S0.Location(loc);
  map.Add(S0);
  if (S.ShapeType() != TopAbs_COMPOUND) return;
  for (TopoDS_Iterator it(S); it.More(); it.Next())
    FillShapesMap(it.Value(), map);
}


//=======================================================================
//function : Transfer
//purpose  : basic working method
//=======================================================================

Standard_Boolean STEPCAFControl_Reader::Transfer(STEPControl_Reader &reader,
  const Standard_Integer nroot,
  Handle(TDocStd_Document) &doc,
  TDF_LabelSequence &Lseq,
  const Standard_Boolean asOne)
{
  reader.ClearShapes();
  Standard_Integer i;

  // Read all shapes
  Standard_Integer num = reader.NbRootsForTransfer();
  if (num <= 0) return Standard_False;
  if (nroot) {
    if (nroot > num) return Standard_False;
    reader.TransferOneRoot(nroot);
  }
  else {
    for (i = 1; i <= num; i++) reader.TransferOneRoot(i);
  }
  num = reader.NbShapes();
  if (num <= 0) return Standard_False;

  // Fill a map of (top-level) shapes resulting from that transfer
  // Only these shapes will be considered further
  TopTools_MapOfShape ShapesMap, NewShapesMap;
  for (i = 1; i <= num; i++) FillShapesMap(reader.Shape(i), ShapesMap);

  // Collect information on shapes originating from SDRs
  // this will be used to distinguish compounds representing assemblies
  // from the ones representing hybrid models and shape sets
  STEPCAFControl_DataMapOfShapePD ShapePDMap;
  STEPCAFControl_DataMapOfPDExternFile PDFileMap;
  Handle(Interface_InterfaceModel) Model = reader.Model();
  const Handle(Transfer_TransientProcess) &TP = reader.WS()->TransferReader()->TransientProcess();
  Standard_Integer nb = Model->NbEntities();

  Handle(TColStd_HSequenceOfTransient) SeqPDS = new TColStd_HSequenceOfTransient;

  for (i = 1; i <= nb; i++) {
    Handle(Standard_Transient) enti = Model->Value(i);
    if (enti->IsKind(STANDARD_TYPE(StepRepr_ProductDefinitionShape))) {
      // sequence for acceleration ReadMaterials
      SeqPDS->Append(enti);
    }
    if (enti->IsKind(STANDARD_TYPE(StepBasic_ProductDefinition))) {
      Handle(StepBasic_ProductDefinition) PD =
        Handle(StepBasic_ProductDefinition)::DownCast(enti);
      Standard_Integer index = TP->MapIndex(PD);
      if (index > 0) {
        Handle(Transfer_Binder) binder = TP->MapItem(index);
        TopoDS_Shape S = TransferBRep::ShapeResult(binder);
        if (!S.IsNull() && ShapesMap.Contains(S)) {
          NewShapesMap.Add(S);
          ShapePDMap.Bind(S, PD);
          Handle(STEPCAFControl_ExternFile) EF;
          PDFileMap.Bind(PD, EF);
        }
      }
    }
    if (enti->IsKind(STANDARD_TYPE(StepShape_ShapeRepresentation))) {
      Standard_Integer index = TP->MapIndex(enti);
      if (index > 0) {
        Handle(Transfer_Binder) binder = TP->MapItem(index);
        TopoDS_Shape S = TransferBRep::ShapeResult(binder);
        if (!S.IsNull() && ShapesMap.Contains(S))
          NewShapesMap.Add(S);
      }
    }
  }

  // get directory name of the main file
  OSD_Path mainfile(reader.WS()->LoadedFile());
  mainfile.SetName("");
  mainfile.SetExtension("");
  TCollection_AsciiString dpath;
  mainfile.SystemName(dpath);

  // Load external references (only for relevant SDRs)
  // and fill map SDR -> extern file
  STEPConstruct_ExternRefs ExtRefs(reader.WS());
  ExtRefs.LoadExternRefs();
  for (i = 1; i <= ExtRefs.NbExternRefs(); i++) {
    // check extern ref format
    Handle(TCollection_HAsciiString) format = ExtRefs.Format(i);
    if (!format.IsNull()) {
      static Handle(TCollection_HAsciiString) ap203 = new TCollection_HAsciiString("STEP AP203");
      static Handle(TCollection_HAsciiString) ap214 = new TCollection_HAsciiString("STEP AP214");
      if (!format->IsSameString(ap203, Standard_False) &&
        !format->IsSameString(ap214, Standard_False)) {
#ifdef OCCT_DEBUG
        cout << "Warning: STEPCAFControl_Reader::Transfer: Extern document is neither STEP AP203 nor AP214" << endl;
#else
        continue;
#endif
      }
    }
#ifdef OCCT_DEBUG
    else cout << "Warning: STEPCAFControl_Reader::Transfer: Extern document format not defined" << endl;
#endif

    // get and check filename of the current extern ref
    const Standard_CString filename = ExtRefs.FileName(i);

#ifdef OCCT_DEBUG
    cout << "filename=" << filename << endl;
#endif

    if (!filename || !filename[0]) {
#ifdef OCCT_DEBUG
      cout << "Warning: STEPCAFControl_Reader::Transfer: Extern reference file name is empty" << endl;
#endif
      continue; // not a valid extern ref
    }

    // compute true path to the extern file
    TCollection_AsciiString fullname = OSD_Path::AbsolutePath(dpath, filename);
    if (fullname.Length() <= 0) fullname = filename;

    /*
        char fullname[1024];
        char *mainfile = reader.WS()->LoadedFile();
        if ( ! mainfile ) mainfile = "";
        Standard_Integer slash = 0;
        for ( Standard_Integer k=0; mainfile[k]; k++ )
          if ( mainfile[k] == '/' ) slash = k;
        strncpy ( fullname, mainfile, slash );
        sprintf ( &fullname[slash], "%s%s", ( mainfile[0] ? "/" : "" ), filename );
    */

    // get and check PD associated with the current extern ref
    Handle(StepBasic_ProductDefinition) PD = ExtRefs.ProdDef(i);
    if (PD.IsNull()) continue; // not a valid extern ref
    if (!PDFileMap.IsBound(PD)) continue; // this PD is not concerned by current transfer

    // read extern file (or use existing data) and record its data
    Handle(STEPCAFControl_ExternFile) EF =
      ReadExternFile(filename, fullname.ToCString(), doc);
    PDFileMap.Bind(PD, EF);
  }

  // and insert them to the document
  Handle(XCAFDoc_ShapeTool) STool = XCAFDoc_DocumentTool::ShapeTool(doc->Main());
  if (STool.IsNull()) return Standard_False;
  XCAFDoc_DataMapOfShapeLabel map;
  if (asOne)
    Lseq.Append(AddShape(reader.OneShape(), STool, NewShapesMap, ShapePDMap, PDFileMap, map));
  else {
    for (i = 1; i <= num; i++) {
      Lseq.Append(AddShape(reader.Shape(i), STool, NewShapesMap, ShapePDMap, PDFileMap, map));
    }
  }

  // read colors
  if (GetColorMode())
    ReadColors(reader.WS(), doc, map);

  // read names
  if (GetNameMode())
    ReadNames(reader.WS(), doc, PDFileMap, map);

  // read validation props
  if (GetPropsMode())
    ReadValProps(reader.WS(), doc, PDFileMap, map);

  // read layers
  if (GetLayerMode())
    ReadLayers(reader.WS(), doc);

  // read SHUO entities from STEP model
  if (GetSHUOMode())
    ReadSHUOs(reader.WS(), doc, PDFileMap, map);

  // read GDT entities from STEP model
  if (GetGDTMode())
    ReadGDTs(reader.WS(), doc);

  // read Material entities from STEP model
  if (GetMatMode())
    ReadMaterials(reader.WS(), doc, SeqPDS);

  // read View entities from STEP model
  if (GetViewMode())
    ReadViews(reader.WS(), doc);

  // Expand resulting CAF structure for sub-shapes (optionally with their
  // names) if requested
  ExpandSubShapes(STool, map, ShapePDMap);

  // Update assembly compounds
  STool->UpdateAssemblies();

  return Standard_True;
}

//=======================================================================
//function : AddShape
//purpose  : 
//=======================================================================

TDF_Label STEPCAFControl_Reader::AddShape(const TopoDS_Shape &S,
  const Handle(XCAFDoc_ShapeTool) &STool,
  const TopTools_MapOfShape &NewShapesMap,
  const STEPCAFControl_DataMapOfShapePD &ShapePDMap,
  const STEPCAFControl_DataMapOfPDExternFile &PDFileMap,
  XCAFDoc_DataMapOfShapeLabel &ShapeLabelMap) const
{
  // if shape has already been mapped, just return corresponding label
  if (ShapeLabelMap.IsBound(S)) {
    return ShapeLabelMap.Find(S);
  }

  // if shape is located, create instance
  if (!S.Location().IsIdentity()) {
    TopoDS_Shape S0 = S;
    TopLoc_Location loc;
    S0.Location(loc);
    AddShape(S0, STool, NewShapesMap, ShapePDMap, PDFileMap, ShapeLabelMap);
    TDF_Label L = STool->AddShape(S, Standard_False); // should create reference
    ShapeLabelMap.Bind(S, L);
    return L;
  }

  // if shape is not compound, simple add it
  if (S.ShapeType() != TopAbs_COMPOUND) {
    TDF_Label L = STool->AddShape(S, Standard_False);
    ShapeLabelMap.Bind(S, L);
    return L;
  }

  // for compounds, compute number of subshapes and check whether this is assembly
  Standard_Boolean isAssembly = Standard_False;
  Standard_Integer nbComponents = 0;
  TopoDS_Iterator it;
  for (it.Initialize(S); it.More() && !isAssembly; it.Next(), nbComponents++) {
    TopoDS_Shape Sub0 = it.Value();
    TopLoc_Location loc;
    Sub0.Location(loc);
    if (NewShapesMap.Contains(Sub0)) isAssembly = Standard_True;
  }

  //  if(nbComponents>0) isAssembly = Standard_True;

    // check whether it has associated external ref
  TColStd_SequenceOfHAsciiString SHAS;
  if (ShapePDMap.IsBound(S) && PDFileMap.IsBound(ShapePDMap.Find(S))) {
    Handle(STEPCAFControl_ExternFile) EF = PDFileMap.Find(ShapePDMap.Find(S));
    if (!EF.IsNull()) {
      // (store information on extern refs in the document)
      SHAS.Append(EF->GetName());
      // if yes, just return corresponding label
      if (!EF->GetLabel().IsNull()) {
        // but if components >0, ignore extern ref!
        if (nbComponents <= 0) {
          ShapeLabelMap.Bind(S, EF->GetLabel());
          STool->SetExternRefs(EF->GetLabel(), SHAS);
          return EF->GetLabel();
        }
      }
#ifdef OCCT_DEBUG
      if (!EF->GetLabel().IsNull())
        cout << "Warning: STEPCAFControl_Reader::AddShape: Non-empty shape with external ref; ref is ignored" << endl;
      else if (nbComponents <= 0)
        cout << "Warning: STEPCAFControl_Reader::AddShape: Result of reading extern ref is Null" << endl;
#endif
    }
  }

  // add compound either as a whole,
  if (!isAssembly) {
    TDF_Label L = STool->AddShape(S, Standard_False);
    if (SHAS.Length() > 0) STool->SetExternRefs(L, SHAS);
    ShapeLabelMap.Bind(S, L);
    return L;
  }

  // or as assembly, component-by-component
  TDF_Label L = STool->NewShape();
  nbComponents = 0;
  for (it.Initialize(S); it.More(); it.Next(), nbComponents++) {
    TopoDS_Shape Sub0 = it.Value();
    TopLoc_Location loc;
    Sub0.Location(loc);
    TDF_Label subL = AddShape(Sub0, STool, NewShapesMap, ShapePDMap, PDFileMap, ShapeLabelMap);
    if (!subL.IsNull()) {
      TDF_Label instL = STool->AddComponent(L, subL, it.Value().Location());
      ShapeLabelMap.Bind(it.Value(), instL);
    }
  }
  if (SHAS.Length() > 0) STool->SetExternRefs(L, SHAS);
  ShapeLabelMap.Bind(S, L);
  //STool->SetShape ( L, S ); // it is necessary for assemblies OCC1747 // commemted by skl for OCC2941

  return L;
}

//=======================================================================
//function : ReadExternFile
//purpose  : 
//=======================================================================

Handle(STEPCAFControl_ExternFile) STEPCAFControl_Reader::ReadExternFile(const Standard_CString file,
  const Standard_CString fullname,
  Handle(TDocStd_Document)& doc)
{
  // if the file is already read, associate it with SDR
  if (myFiles.IsBound(file)) {
    return myFiles.ChangeFind(file);
  }

#ifdef OCCT_DEBUG
  cout << "Reading extern file: " << fullname << endl;
#endif

  // create new WorkSession and Reader
  Handle(XSControl_WorkSession) newWS = new XSControl_WorkSession;
  newWS->SelectNorm("STEP");
  STEPControl_Reader sr(newWS, Standard_False);

  // start to fill the resulting ExternFile structure
  Handle(STEPCAFControl_ExternFile) EF = new STEPCAFControl_ExternFile;
  EF->SetWS(newWS);
  EF->SetName(new TCollection_HAsciiString(file));

  // read file
  EF->SetLoadStatus(sr.ReadFile(fullname));

  // transfer in single-result mode
  if (EF->GetLoadStatus() == IFSelect_RetDone) {
    TDF_LabelSequence labels;
    EF->SetTransferStatus(Transfer(sr, 0, doc, labels, Standard_True));
    if (labels.Length() > 0) EF->SetLabel(labels.Value(1));
  }

  // add read file to dictionary
  myFiles.Bind(file, EF);

  return EF;
}

//=======================================================================
//function : findStyledSR
//purpose  : auxilary
//=======================================================================
static void findStyledSR(const Handle(StepVisual_StyledItem) &style,
  Handle(StepShape_ShapeRepresentation)& aSR)
{
  // search Shape Represenatation for component styled item
  for (Standard_Integer j = 1; j <= style->NbStyles(); j++) {
    Handle(StepVisual_PresentationStyleByContext) PSA =
      Handle(StepVisual_PresentationStyleByContext)::DownCast(style->StylesValue(j));
    if (PSA.IsNull())
      continue;
    StepVisual_StyleContextSelect aStyleCntxSlct = PSA->StyleContext();
    Handle(StepShape_ShapeRepresentation) aCurrentSR =
      Handle(StepShape_ShapeRepresentation)::DownCast(aStyleCntxSlct.Representation());
    if (aCurrentSR.IsNull())
      continue;
    aSR = aCurrentSR;
    break;
  }
}


//=======================================================================
//function : propagateColorToParts
//purpose  : auxilary, propagate color styles from assemblies to parts
//=======================================================================

static void propagateColorToParts(const Handle(XCAFDoc_ShapeTool)& theSTool,
                                  const Handle(XCAFDoc_ColorTool)& theCTool,
                                  const TDF_Label& theRoot)
{
  // collect components to propagate
  TDF_LabelSequence aComponents;
  if (theRoot.IsEqual(theSTool->Label()))
    theSTool->GetFreeShapes(aComponents);
  else
    theSTool->GetComponents(theRoot, aComponents);

  // iterate each component
  for (TDF_LabelSequence::Iterator anIt(aComponents); anIt.More(); anIt.Next())
  {
    // get original label
    TDF_Label anOriginalL = anIt.Value();
    theSTool->GetReferredShape(anOriginalL, anOriginalL);

    // propagate to components without own colors
    TDF_Label aColorL, aDummyColorL;
    for (Standard_Integer aType = 1; aType <= 3; aType++)
    {
      if (theCTool->GetColor(theRoot, (XCAFDoc_ColorType)aType, aColorL) &&
          !theCTool->GetColor(anOriginalL, (XCAFDoc_ColorType)aType, aDummyColorL))
        theCTool->SetColor(anOriginalL, aColorL, (XCAFDoc_ColorType)aType);
    }
    if (!theCTool->IsVisible(theRoot))
      theCTool->SetVisibility(anOriginalL, Standard_False);

    // propagate to next level children
    if (theSTool->IsAssembly(anOriginalL))
      propagateColorToParts(theSTool, theCTool, anOriginalL);
  }
}
//=======================================================================
//function : ReadColors
//purpose  : 
//=======================================================================

Standard_Boolean STEPCAFControl_Reader::ReadColors(const Handle(XSControl_WorkSession) &WS,
  Handle(TDocStd_Document)& Doc,
  const XCAFDoc_DataMapOfShapeLabel &ShapeLabelMap) const
{
  STEPConstruct_Styles Styles(WS);
  if (!Styles.LoadStyles()) {
#ifdef OCCT_DEBUG
    cout << "Warning: no styles are found in the model" << endl;
#endif
    return Standard_False;
  }
  // searching for invisible items in the model
  Handle(TColStd_HSequenceOfTransient) aHSeqOfInvisStyle = new TColStd_HSequenceOfTransient;
  Styles.LoadInvisStyles(aHSeqOfInvisStyle);

  Handle(XCAFDoc_ColorTool) CTool = XCAFDoc_DocumentTool::ColorTool(Doc->Main());
  if (CTool.IsNull()) return Standard_False;
  Handle(XCAFDoc_ShapeTool) STool = XCAFDoc_DocumentTool::ShapeTool(Doc->Main());
  if (STool.IsNull()) return Standard_False;

  // parse and search for color attributes
  Standard_Integer nb = Styles.NbStyles();
  for (Standard_Integer i = 1; i <= nb; i++) {
    Handle(StepVisual_StyledItem) style = Styles.Style(i);
    if (style.IsNull()) continue;

    Standard_Boolean IsVisible = Standard_True;
    // check the visibility of styled item.
    for (Standard_Integer si = 1; si <= aHSeqOfInvisStyle->Length(); si++) {
      if (style != aHSeqOfInvisStyle->Value(si))
        continue;
      // found that current style is invisible.
      IsVisible = Standard_False;
      break;
    }

    Handle(StepVisual_Colour) SurfCol, BoundCol, CurveCol;
    // check if it is component style
    Standard_Boolean IsComponent = Standard_False;
    if (!Styles.GetColors(style, SurfCol, BoundCol, CurveCol, IsComponent) && IsVisible)
      continue;

    // collect styled items
    NCollection_Vector<StepVisual_StyledItemTarget> anItems;
    if (!style->ItemAP242().IsNull()) {
      anItems.Append(style->ItemAP242());
    }

    const Handle(Transfer_TransientProcess) &TP = WS->TransferReader()->TransientProcess();
    for (Standard_Integer itemIt = 0; itemIt < anItems.Length(); itemIt++) {
      Standard_Integer index = TP->MapIndex(anItems.Value(itemIt).Value());
      TopoDS_Shape S;
      if (index > 0) {
        Handle(Transfer_Binder) binder = TP->MapItem(index);
        S = TransferBRep::ShapeResult(binder);
      }
      Standard_Boolean isSkipSHUOstyle = Standard_False;
      // take shape with real location.
      while (IsComponent) {
        // take SR of NAUO
        Handle(StepShape_ShapeRepresentation) aSR;
        findStyledSR(style, aSR);
        // search for SR along model
        if (aSR.IsNull())
          break;
        Interface_EntityIterator subs = WS->HGraph()->Graph().Sharings(aSR);
        Handle(StepShape_ShapeDefinitionRepresentation) aSDR;
        for (subs.Start(); subs.More(); subs.Next()) {
          aSDR = Handle(StepShape_ShapeDefinitionRepresentation)::DownCast(subs.Value());
          if (aSDR.IsNull())
            continue;
          StepRepr_RepresentedDefinition aPDSselect = aSDR->Definition();
          Handle(StepRepr_ProductDefinitionShape) PDS =
            Handle(StepRepr_ProductDefinitionShape)::DownCast(aPDSselect.PropertyDefinition());
          if (PDS.IsNull())
            continue;
          StepRepr_CharacterizedDefinition aCharDef = PDS->Definition();

          Handle(StepRepr_AssemblyComponentUsage) ACU =
            Handle(StepRepr_AssemblyComponentUsage)::DownCast(aCharDef.ProductDefinitionRelationship());
          if (ACU.IsNull())
            continue;
          // PTV 10.02.2003 skip styled item that refer to SHUO
          if (ACU->IsKind(STANDARD_TYPE(StepRepr_SpecifiedHigherUsageOccurrence))) {
            isSkipSHUOstyle = Standard_True;
            break;
          }
          Handle(StepRepr_NextAssemblyUsageOccurrence) NAUO =
            Handle(StepRepr_NextAssemblyUsageOccurrence)::DownCast(ACU);
          if (NAUO.IsNull())
            continue;

          TopoDS_Shape aSh;
          // PTV 10.02.2003 to find component of assembly CORRECTLY
          STEPConstruct_Tool Tool(WS);
          TDF_Label aShLab = FindInstance(NAUO, CTool->ShapeTool(), Tool, ShapeLabelMap);
          aSh = CTool->ShapeTool()->GetShape(aShLab);
          if (!aSh.IsNull()) {
            S = aSh;
            break;
          }
        }
        break;
      }
      if (isSkipSHUOstyle)
        continue; // skip styled item which refer to SHUO

      if (S.IsNull())
        continue;

      if (!SurfCol.IsNull() || !BoundCol.IsNull() || !CurveCol.IsNull() || !IsVisible)
      {
        TDF_Label aL;
        Standard_Boolean isFound = STool->SearchUsingMap(S, aL, Standard_False, Standard_True);
        if (!SurfCol.IsNull() || !BoundCol.IsNull() || !CurveCol.IsNull())
        {
          Quantity_Color aSCol, aBCol, aCCol;
          if (!SurfCol.IsNull())
            Styles.DecodeColor(SurfCol, aSCol);
          if (!BoundCol.IsNull())
            Styles.DecodeColor(BoundCol, aBCol);
          if (!CurveCol.IsNull())
            Styles.DecodeColor(CurveCol, aCCol);
          if (isFound)
          {
            if (!SurfCol.IsNull())
              CTool->SetColor(aL, aSCol, XCAFDoc_ColorSurf);
            if (!BoundCol.IsNull())
              CTool->SetColor(aL, aBCol, XCAFDoc_ColorCurv);
            if (!CurveCol.IsNull())
              CTool->SetColor(aL, aCCol, XCAFDoc_ColorCurv);
          }
          else
          {
            for (TopoDS_Iterator it(S); it.More(); it.Next())
            {
              TDF_Label aL1;
              if (STool->SearchUsingMap(it.Value(), aL1, Standard_False, Standard_True))
              {
                if (!SurfCol.IsNull())
                  CTool->SetColor(aL1, aSCol, XCAFDoc_ColorSurf);
                if (!BoundCol.IsNull())
                  CTool->SetColor(aL1, aBCol, XCAFDoc_ColorCurv);
                if (!CurveCol.IsNull())
                  CTool->SetColor(aL1, aCCol, XCAFDoc_ColorCurv);
              }
            }
          }
        }
        if (!IsVisible)
        {
          // sets the invisibility for shape.
          if (isFound)
            CTool->SetVisibility(aL, Standard_False);
        }
      }
    }
  }
  CTool->ReverseChainsOfTreeNodes();

  // some colors can be attached to assemblies, propagate them to components
  propagateColorToParts(STool, CTool, STool->Label());
  return Standard_True;
}

//=======================================================================
//function : GetLabelFromPD
//purpose  : 
//=======================================================================

static TDF_Label GetLabelFromPD(const Handle(StepBasic_ProductDefinition) &PD,
  const Handle(XCAFDoc_ShapeTool) &STool,
  const Handle(Transfer_TransientProcess) &TP,
  const STEPCAFControl_DataMapOfPDExternFile &PDFileMap,
  const XCAFDoc_DataMapOfShapeLabel &ShapeLabelMap)
{
  TDF_Label L;
  if (PDFileMap.IsBound(PD)) {
    Handle(STEPCAFControl_ExternFile) EF = PDFileMap.Find(PD);
    if (!EF.IsNull()) {
      L = EF->GetLabel();
      if (!L.IsNull()) return L;
    }
  }

  TopoDS_Shape S;
  Handle(Transfer_Binder) binder = TP->Find(PD);
  if (binder.IsNull() || !binder->HasResult()) return L;
  S = TransferBRep::ShapeResult(TP, binder);
  if (S.IsNull()) return L;

  if (ShapeLabelMap.IsBound(S))
    L = ShapeLabelMap.Find(S);
  if (L.IsNull())
    STool->Search(S, L, Standard_True, Standard_True, Standard_False);
  return L;
}

//=======================================================================
//function : FindInstance
//purpose  : 
//=======================================================================

TDF_Label STEPCAFControl_Reader::FindInstance(const Handle(StepRepr_NextAssemblyUsageOccurrence) &NAUO,
  const Handle(XCAFDoc_ShapeTool) &STool,
  const STEPConstruct_Tool &Tool,
  const XCAFDoc_DataMapOfShapeLabel &ShapeLabelMap)
{
  TDF_Label L;

  // get shape resulting from CDSR (in fact, only location is interesting)
  Handle(Transfer_TransientProcess) TP = Tool.TransientProcess();
  Handle(Transfer_Binder) binder = TP->Find(NAUO);
  if (binder.IsNull() || !binder->HasResult()) {
#ifdef OCCT_DEBUG
    cout << "Error: STEPCAFControl_Reader::FindInstance: NAUO is not mapped to shape" << endl;
#endif
    return L;
  }

  TopoDS_Shape S = TransferBRep::ShapeResult(TP, binder);
  if (S.IsNull()) {
#ifdef OCCT_DEBUG
    cout << "Error: STEPCAFControl_Reader::FindInstance: NAUO is not mapped to shape" << endl;
#endif
    return L;
  }

  if (ShapeLabelMap.IsBound(S))
    L = ShapeLabelMap(S);
  else
    STool->Search(S, L, Standard_True, Standard_True, Standard_False);

  return L;
}

//=======================================================================
//function : ReadNames
//purpose  : 
//=======================================================================

Standard_Boolean STEPCAFControl_Reader::ReadNames(const Handle(XSControl_WorkSession) &WS,
  Handle(TDocStd_Document)& Doc,
  const STEPCAFControl_DataMapOfPDExternFile &PDFileMap,
  const XCAFDoc_DataMapOfShapeLabel &ShapeLabelMap) const
{
  // get starting data
  const Handle(Interface_InterfaceModel) &Model = WS->Model();
  const Handle(XSControl_TransferReader) &TR = WS->TransferReader();
  const Handle(Transfer_TransientProcess) &TP = TR->TransientProcess();
  Handle(XCAFDoc_ShapeTool) STool = XCAFDoc_DocumentTool::ShapeTool(Doc->Main());
  if (STool.IsNull()) return Standard_False;
  STEPConstruct_Tool Tool(WS);

  // iterate on model to find all SDRs and CDSRs
  Standard_Integer nb = Model->NbEntities();
  Handle(Standard_Type) tNAUO = STANDARD_TYPE(StepRepr_NextAssemblyUsageOccurrence);
  Handle(Standard_Type) tPD = STANDARD_TYPE(StepBasic_ProductDefinition);
  Handle(Standard_Type) tPDWAD = STANDARD_TYPE(StepBasic_ProductDefinitionWithAssociatedDocuments);
  Handle(TCollection_HAsciiString) name;
  TDF_Label L;
  for (Standard_Integer i = 1; i <= nb; i++) {
    Handle(Standard_Transient) enti = Model->Value(i);

    // get description of NAUO
    if (enti->DynamicType() == tNAUO) {
      L.Nullify();
      Handle(StepRepr_NextAssemblyUsageOccurrence) NAUO =
        Handle(StepRepr_NextAssemblyUsageOccurrence)::DownCast(enti);
      if (NAUO.IsNull()) continue;
      Interface_EntityIterator subs = WS->Graph().Sharings(NAUO);
      for (subs.Start(); subs.More(); subs.Next()) {
        Handle(StepRepr_ProductDefinitionShape) PDS =
          Handle(StepRepr_ProductDefinitionShape)::DownCast(subs.Value());
        if (PDS.IsNull()) continue;
        Handle(StepBasic_ProductDefinitionRelationship) PDR = PDS->Definition().ProductDefinitionRelationship();
        if (PDR.IsNull()) continue;
        if (PDR->HasDescription() &&
          PDR->Description()->UsefullLength() > 0) name = PDR->Description();
        else if (!PDR->Name().IsNull() && PDR->Name()->UsefullLength() > 0) name = PDR->Name();
        else if (!PDR->Id().IsNull()) name = PDR->Id();
        else name = new TCollection_HAsciiString;
      }
      // find proper label
      L = FindInstance(NAUO, STool, Tool, ShapeLabelMap);
      if (L.IsNull()) continue;

      TCollection_ExtendedString str = convertName (name->String());
      TDataStd_Name::Set(L, str);
    }

    // for PD get name of associated product
    if (enti->DynamicType() == tPD || enti->DynamicType() == tPDWAD) {
      L.Nullify();
      Handle(StepBasic_ProductDefinition) PD =
        Handle(StepBasic_ProductDefinition)::DownCast(enti);
      if (PD.IsNull()) continue;
      Handle(StepBasic_Product) Prod = (!PD->Formation().IsNull() ? PD->Formation()->OfProduct() : NULL);
      if (Prod.IsNull())
        name = new TCollection_HAsciiString;
      else if (!Prod->Name().IsNull() && Prod->Name()->UsefullLength() > 0)
        name = Prod->Name();
      else if (!Prod->Id().IsNull())
        name = Prod->Id();
      else
        name = new TCollection_HAsciiString;
      L = GetLabelFromPD(PD, STool, TP, PDFileMap, ShapeLabelMap);
      if (L.IsNull()) continue;
      TCollection_ExtendedString str = convertName (name->String());
      TDataStd_Name::Set(L, str);
    }
    // set a name to the document
    //TCollection_ExtendedString str = convertName (name->String());
    //TDataStd_Name::Set ( L, str );
  }

  return Standard_True;
}

//=======================================================================
//function : GetLabelFromPD
//purpose  : 
//=======================================================================

static TDF_Label GetLabelFromPD(const Handle(StepBasic_ProductDefinition) &PD,
  const Handle(XCAFDoc_ShapeTool) &STool,
  const STEPConstruct_ValidationProps &Props,
  const STEPCAFControl_DataMapOfPDExternFile &PDFileMap,
  const XCAFDoc_DataMapOfShapeLabel &ShapeLabelMap)
{
  TDF_Label L;
  if (PDFileMap.IsBound(PD)) {
    Handle(STEPCAFControl_ExternFile) EF = PDFileMap.Find(PD);
    if (!EF.IsNull()) {
      L = EF->GetLabel();
      if (!L.IsNull()) return L;
    }
  }
  TopoDS_Shape S = Props.GetPropShape(PD);
  if (S.IsNull()) return L;
  if (ShapeLabelMap.IsBound(S))
    L = ShapeLabelMap.Find(S);
  if (L.IsNull())
    STool->Search(S, L, Standard_True, Standard_True, Standard_False);
  return L;
}

//=======================================================================
//function : ReadValProps
//purpose  : 
//=======================================================================

Standard_Boolean STEPCAFControl_Reader::ReadValProps(const Handle(XSControl_WorkSession) &WS,
  Handle(TDocStd_Document)& Doc,
  const STEPCAFControl_DataMapOfPDExternFile &PDFileMap,
  const XCAFDoc_DataMapOfShapeLabel &ShapeLabelMap) const
{
  // get starting data
  const Handle(XSControl_TransferReader) &TR = WS->TransferReader();
  const Handle(Transfer_TransientProcess) &TP = TR->TransientProcess();
  Handle(XCAFDoc_ShapeTool) STool = XCAFDoc_DocumentTool::ShapeTool(Doc->Main());
  if (STool.IsNull()) return Standard_False;

  // load props from the STEP model
  TColStd_SequenceOfTransient props;
  STEPConstruct_ValidationProps Props(WS);
  if (!Props.LoadProps(props)) {
#ifdef OCCT_DEBUG
    cout << "Warning: no validation props found in the model" << endl;
#endif
    return Standard_False;
  }

  // interpret props one by one
  for (Standard_Integer i = 1; i <= props.Length(); i++) {
    Handle(StepRepr_PropertyDefinitionRepresentation) PDR =
      Handle(StepRepr_PropertyDefinitionRepresentation)::DownCast(props.Value(i));
    if (PDR.IsNull()) continue;

    TDF_Label L;

    Handle(StepRepr_PropertyDefinition) PD = PDR->Definition().PropertyDefinition();
    Interface_EntityIterator subs = Props.Graph().Shareds(PD);
    for (subs.Start(); L.IsNull() && subs.More(); subs.Next()) {
      if (subs.Value()->IsKind(STANDARD_TYPE(StepRepr_ProductDefinitionShape))) {
        Handle(StepRepr_ProductDefinitionShape) PDS = Handle(StepRepr_ProductDefinitionShape)::DownCast(subs.Value());
        if (PDS.IsNull()) continue;
        // find corresponding NAUO
        Handle(StepRepr_NextAssemblyUsageOccurrence) NAUO;
        Interface_EntityIterator subs1 = Props.Graph().Shareds(PDS);
        for (subs1.Start(); NAUO.IsNull() && subs1.More(); subs1.Next()) {
          if (subs1.Value()->IsKind(STANDARD_TYPE(StepRepr_NextAssemblyUsageOccurrence)))
            NAUO = Handle(StepRepr_NextAssemblyUsageOccurrence)::DownCast(subs1.Value());
        }
        if (!NAUO.IsNull()) {
          L = FindInstance(NAUO, STool, WS, ShapeLabelMap);
          if (L.IsNull()) continue;
        }
        else {
          // find corresponding ProductDefinition:
          Handle(StepBasic_ProductDefinition) ProdDef;
          Interface_EntityIterator subsPDS = Props.Graph().Shareds(PDS);
          for (subsPDS.Start(); ProdDef.IsNull() && subsPDS.More(); subsPDS.Next()) {
            if (subsPDS.Value()->IsKind(STANDARD_TYPE(StepBasic_ProductDefinition)))
              ProdDef = Handle(StepBasic_ProductDefinition)::DownCast(subsPDS.Value());
          }
          if (ProdDef.IsNull()) continue;
          L = GetLabelFromPD(ProdDef, STool, Props, PDFileMap, ShapeLabelMap);
        }
      }

      if (subs.Value()->IsKind(STANDARD_TYPE(StepRepr_ShapeAspect))) {
        Handle(StepRepr_ShapeAspect) SA = Handle(StepRepr_ShapeAspect)::DownCast(subs.Value());
        if (SA.IsNull()) continue;
        // find ShapeRepresentation
        Handle(StepShape_ShapeRepresentation) SR;
        Interface_EntityIterator subs1 = Props.Graph().Sharings(SA);
        for (subs1.Start(); subs1.More() && SR.IsNull(); subs1.Next()) {
          Handle(StepRepr_PropertyDefinition) PropD1 =
            Handle(StepRepr_PropertyDefinition)::DownCast(subs1.Value());
          if (PropD1.IsNull()) continue;
          Interface_EntityIterator subs2 = Props.Graph().Sharings(PropD1);
          for (subs2.Start(); subs2.More() && SR.IsNull(); subs2.Next()) {
            Handle(StepShape_ShapeDefinitionRepresentation) SDR =
              Handle(StepShape_ShapeDefinitionRepresentation)::DownCast(subs2.Value());
            if (SDR.IsNull()) continue;
            SR = Handle(StepShape_ShapeRepresentation)::DownCast(SDR->UsedRepresentation());
          }
        }
        if (SR.IsNull()) continue;
        Handle(Transfer_Binder) binder;
        for (Standard_Integer ir = 1; ir <= SR->NbItems() && binder.IsNull(); ir++) {
          if (SR->ItemsValue(ir)->IsKind(STANDARD_TYPE(StepShape_SolidModel))) {
            Handle(StepShape_SolidModel) SM =
              Handle(StepShape_SolidModel)::DownCast(SR->ItemsValue(ir));
            binder = TP->Find(SM);
          }
          else if (SR->ItemsValue(ir)->IsKind(STANDARD_TYPE(StepShape_ShellBasedSurfaceModel))) {
            Handle(StepShape_ShellBasedSurfaceModel) SBSM =
              Handle(StepShape_ShellBasedSurfaceModel)::DownCast(SR->ItemsValue(ir));
            binder = TP->Find(SBSM);
          }
          else if (SR->ItemsValue(ir)->IsKind(STANDARD_TYPE(StepShape_GeometricSet))) {
            Handle(StepShape_GeometricSet) GS =
              Handle(StepShape_GeometricSet)::DownCast(SR->ItemsValue(ir));
            binder = TP->Find(GS);
          }
        }
        if (binder.IsNull() || !binder->HasResult()) continue;
        TopoDS_Shape S;
        S = TransferBRep::ShapeResult(TP, binder);
        if (S.IsNull()) continue;
        if (ShapeLabelMap.IsBound(S))
          L = ShapeLabelMap.Find(S);
        if (L.IsNull())
          STool->Search(S, L, Standard_True, Standard_True, Standard_True);
      }
    }

    if (L.IsNull()) continue;

    // decode validation properties
    Handle(StepRepr_Representation) rep = PDR->UsedRepresentation();
    for (Standard_Integer j = 1; j <= rep->NbItems(); j++) {
      Handle(StepRepr_RepresentationItem) ent = rep->ItemsValue(j);
      Standard_Boolean isArea;
      Standard_Real val;
      gp_Pnt pos;
      if (Props.GetPropReal(ent, val, isArea)) {
        if (isArea) XCAFDoc_Area::Set(L, val);
        else XCAFDoc_Volume::Set(L, val);
      }
      else if (Props.GetPropPnt(ent, rep->ContextOfItems(), pos)) {
        XCAFDoc_Centroid::Set(L, pos);
      }
    }
  }
  return Standard_True;
}

//=======================================================================
//function : ReadLayers
//purpose  : 
//=======================================================================

Standard_Boolean STEPCAFControl_Reader::ReadLayers(const Handle(XSControl_WorkSession) &WS,
  Handle(TDocStd_Document)& Doc) const
{
  const Handle(Interface_InterfaceModel) &Model = WS->Model();
  const Handle(XSControl_TransferReader) &TR = WS->TransferReader();
  const Handle(Transfer_TransientProcess) &TP = TR->TransientProcess();
  Handle(XCAFDoc_ShapeTool) STool = XCAFDoc_DocumentTool::ShapeTool(Doc->Main());
  if (STool.IsNull()) return Standard_False;
  Handle(XCAFDoc_LayerTool) LTool = XCAFDoc_DocumentTool::LayerTool(Doc->Main());
  if (LTool.IsNull()) return Standard_False;

  Handle(Standard_Type) tSVPLA = STANDARD_TYPE(StepVisual_PresentationLayerAssignment);
  Standard_Integer nb = Model->NbEntities();
  Handle(TCollection_HAsciiString) name;

  for (Standard_Integer i = 1; i <= nb; i++) {
    Handle(Standard_Transient) enti = Model->Value(i);
    if (!enti->IsKind(tSVPLA)) continue;
    Handle(StepVisual_PresentationLayerAssignment) SVPLA =
      Handle(StepVisual_PresentationLayerAssignment)::DownCast(enti);
    if (SVPLA->AssignedItems().IsNull())
      continue;

    Handle(TCollection_HAsciiString) descr = SVPLA->Description();
    Handle(TCollection_HAsciiString) hName = SVPLA->Name();
    TCollection_ExtendedString aLayerName(hName->String());

    // find a target shape and its label in the document
    for (Standard_Integer j = 1; j <= SVPLA->NbAssignedItems(); j++) {
      StepVisual_LayeredItem LI = SVPLA->AssignedItemsValue(j);
      Handle(Transfer_Binder) binder = TP->Find(LI.Value());
      if (binder.IsNull() || !binder->HasResult()) continue;

      TopoDS_Shape S = TransferBRep::ShapeResult(TP, binder);
      if (S.IsNull()) continue;

      TDF_Label shL;
      if (!STool->Search(S, shL, Standard_True, Standard_True, Standard_True)) continue;
      LTool->SetLayer(shL, aLayerName);
    }

    // check invisibility
    Interface_EntityIterator subs = WS->Graph().Sharings(SVPLA);
    for (subs.Start(); subs.More(); subs.Next()) {
      if (!subs.Value()->IsKind(STANDARD_TYPE(StepVisual_Invisibility))) continue;
#ifdef OCCT_DEBUG
      cout << "\tLayer \"" << aLayerName << "\" is invisible" << endl;
#endif
      //TDF_Label InvLayerLab = LTool->FindLayer(aLayerName);
      TDF_Label InvLayerLab = LTool->AddLayer(aLayerName); //skl for OCC3926
      TDataStd_UAttribute::Set (InvLayerLab, XCAFDoc::InvisibleGUID());
    }
  }
  return Standard_True;
}

//=======================================================================
//function : ReadSHUOs
//purpose  : 
//=======================================================================

static Standard_Boolean findNextSHUOlevel(const Handle(XSControl_WorkSession) &WS,
  const Handle(StepRepr_SpecifiedHigherUsageOccurrence)& SHUO,
  const Handle(XCAFDoc_ShapeTool)& STool,
  const STEPCAFControl_DataMapOfPDExternFile &PDFileMap,
  const XCAFDoc_DataMapOfShapeLabel &ShapeLabelMap,
  TDF_LabelSequence& aLabels)
{
  Interface_EntityIterator subs = WS->HGraph()->Graph().Sharings(SHUO);
  Handle(StepRepr_SpecifiedHigherUsageOccurrence) subSHUO;
  for (subs.Start(); subs.More(); subs.Next()) {
    if (subs.Value()->IsKind(STANDARD_TYPE(StepRepr_SpecifiedHigherUsageOccurrence))) {
      subSHUO = Handle(StepRepr_SpecifiedHigherUsageOccurrence)::DownCast(subs.Value());
      break;
    }
  }
  if (subSHUO.IsNull())
    return Standard_False;

  Handle(StepRepr_NextAssemblyUsageOccurrence) NUNAUO = subSHUO->NextUsage();
  if (NUNAUO.IsNull())
    return Standard_False;
  //   Handle(Interface_InterfaceModel) Model = WS->Model();
  //   Handle(XSControl_TransferReader) TR = WS->TransferReader();
  //   Handle(Transfer_TransientProcess) TP = TR->TransientProcess();
  //   Handle(Transfer_Binder) binder = TP->Find(NUNAUO);
  //   if ( binder.IsNull() || ! binder->HasResult() )
  //     return Standard_False;
  //   TopoDS_Shape NUSh = TransferBRep::ShapeResult ( TP, binder );
    // get label of NAUO next level
  TDF_Label NULab;
  STEPConstruct_Tool Tool(WS);
  NULab = STEPCAFControl_Reader::FindInstance(NUNAUO, STool, Tool, ShapeLabelMap);
  //   STool->Search(NUSh, NUlab);
  if (NULab.IsNull())
    return Standard_False;
  aLabels.Append(NULab);
  // and check by recurse.
  findNextSHUOlevel(WS, subSHUO, STool, PDFileMap, ShapeLabelMap, aLabels);
  return Standard_True;
}


//=======================================================================
//function : setSHUOintoDoc
//purpose  : auxilary
//=======================================================================
static TDF_Label setSHUOintoDoc(const Handle(XSControl_WorkSession) &WS,
  const Handle(StepRepr_SpecifiedHigherUsageOccurrence)& SHUO,
  const Handle(XCAFDoc_ShapeTool)& STool,
  const STEPCAFControl_DataMapOfPDExternFile &PDFileMap,
  const XCAFDoc_DataMapOfShapeLabel &ShapeLabelMap)
{
  TDF_Label aMainLabel;
  // get upper usage NAUO from SHUO.
  Handle(StepRepr_NextAssemblyUsageOccurrence) UUNAUO =
    Handle(StepRepr_NextAssemblyUsageOccurrence)::DownCast(SHUO->UpperUsage());
  Handle(StepRepr_NextAssemblyUsageOccurrence) NUNAUO = SHUO->NextUsage();
  if (UUNAUO.IsNull() || NUNAUO.IsNull()) {
#ifdef OCCT_DEBUG
    cout << "Warning: " << __FILE__ << ": Upper_usage or Next_usage of styled SHUO is null. Skip it" << endl;
#endif
    return aMainLabel;
  }
  //   Handle(Interface_InterfaceModel) Model = WS->Model();
  //   Handle(XSControl_TransferReader) TR = WS->TransferReader();
  //   Handle(Transfer_TransientProcess) TP = TR->TransientProcess();
  //   TopoDS_Shape UUSh, NUSh;
  //   Handle(Transfer_Binder) binder = TP->Find(UUNAUO);
  //   if ( binder.IsNull() || ! binder->HasResult() )
  //     return aMainLabel;
  //   UUSh = TransferBRep::ShapeResult ( TP, binder );
  //   binder = TP->Find(NUNAUO);
  //   if ( binder.IsNull() || ! binder->HasResult() )
  //     return aMainLabel;
  //   NUSh = TransferBRep::ShapeResult ( TP, binder );

    // get first labels for first SHUO attribute
  TDF_Label UULab, NULab;
  STEPConstruct_Tool Tool(WS);
  UULab = STEPCAFControl_Reader::FindInstance(UUNAUO, STool, Tool, ShapeLabelMap);
  NULab = STEPCAFControl_Reader::FindInstance(NUNAUO, STool, Tool, ShapeLabelMap);

  //   STool->Search(UUSh, UULab);
  //   STool->Search(NUSh, NULab);
  if (UULab.IsNull() || NULab.IsNull()) return aMainLabel;
  //create sequence fo labels to set SHUO structure into the document
  TDF_LabelSequence ShuoLabels;
  ShuoLabels.Append(UULab);
  ShuoLabels.Append(NULab);
  // add all other labels of sub SHUO entities
  findNextSHUOlevel(WS, SHUO, STool, PDFileMap, ShapeLabelMap, ShuoLabels);
  // last accord for SHUO
  Handle(XCAFDoc_GraphNode) anSHUOAttr;
  if (STool->SetSHUO(ShuoLabels, anSHUOAttr))
    aMainLabel = anSHUOAttr->Label();

  return aMainLabel;
}


//=======================================================================
//function : ReadSHUOs
//purpose  : 
//=======================================================================

Standard_Boolean STEPCAFControl_Reader::ReadSHUOs(const Handle(XSControl_WorkSession) &WS,
  Handle(TDocStd_Document)& Doc,
  const STEPCAFControl_DataMapOfPDExternFile &PDFileMap,
  const XCAFDoc_DataMapOfShapeLabel &ShapeLabelMap) const
{
  // the big part code duplication from ReadColors.
  // It is possible to share this code functionality, just to decide how ???
  Handle(XCAFDoc_ColorTool) CTool = XCAFDoc_DocumentTool::ColorTool(Doc->Main());
  Handle(XCAFDoc_ShapeTool) STool = CTool->ShapeTool();

  STEPConstruct_Styles Styles(WS);
  if (!Styles.LoadStyles()) {
#ifdef OCCT_DEBUG
    cout << "Warning: no styles are found in the model" << endl;
#endif
    return Standard_False;
  }
  // searching for invisible items in the model
  Handle(TColStd_HSequenceOfTransient) aHSeqOfInvisStyle = new TColStd_HSequenceOfTransient;
  Styles.LoadInvisStyles(aHSeqOfInvisStyle);
  // parse and search for color attributes
  Standard_Integer nb = Styles.NbStyles();
  for (Standard_Integer i = 1; i <= nb; i++) {
    Handle(StepVisual_StyledItem) style = Styles.Style(i);
    if (style.IsNull()) continue;

    Standard_Boolean IsVisible = Standard_True;
    // check the visibility of styled item.
    for (Standard_Integer si = 1; si <= aHSeqOfInvisStyle->Length(); si++) {
      if (style != aHSeqOfInvisStyle->Value(si))
        continue;
      // found that current style is invisible.
#ifdef OCCT_DEBUG
      cout << "Warning: item No " << i << "(" << style->Item()->DynamicType()->Name() << ") is invisible" << endl;
#endif
      IsVisible = Standard_False;
      break;
    }

    Handle(StepVisual_Colour) SurfCol, BoundCol, CurveCol;
    // check if it is component style
    Standard_Boolean IsComponent = Standard_False;
    if (!Styles.GetColors(style, SurfCol, BoundCol, CurveCol, IsComponent) && IsVisible)
      continue;
    if (!IsComponent)
      continue;
    Handle(StepShape_ShapeRepresentation) aSR;
    findStyledSR(style, aSR);
    // search for SR along model
    if (aSR.IsNull())
      continue;
    Interface_EntityIterator subs = WS->HGraph()->Graph().Sharings(aSR);
    Handle(StepShape_ShapeDefinitionRepresentation) aSDR;
    for (subs.Start(); subs.More(); subs.Next()) {
      aSDR = Handle(StepShape_ShapeDefinitionRepresentation)::DownCast(subs.Value());
      if (aSDR.IsNull())
        continue;
      StepRepr_RepresentedDefinition aPDSselect = aSDR->Definition();
      Handle(StepRepr_ProductDefinitionShape) PDS =
        Handle(StepRepr_ProductDefinitionShape)::DownCast(aPDSselect.PropertyDefinition());
      if (PDS.IsNull())
        continue;
      StepRepr_CharacterizedDefinition aCharDef = PDS->Definition();
      Handle(StepRepr_SpecifiedHigherUsageOccurrence) SHUO =
        Handle(StepRepr_SpecifiedHigherUsageOccurrence)::DownCast(aCharDef.ProductDefinitionRelationship());
      if (SHUO.IsNull())
        continue;

      // set the SHUO structure to the document
      TDF_Label aLabelForStyle = setSHUOintoDoc(WS, SHUO, STool, PDFileMap, ShapeLabelMap);
      if (aLabelForStyle.IsNull()) {
#ifdef OCCT_DEBUG
        cout << "Warning: " << __FILE__ << ": coudnot create SHUO structure in the document" << endl;
#endif
        continue;
      }
      // now set the style to the SHUO main label.
      if (!SurfCol.IsNull()) {
        Quantity_Color col;
        Styles.DecodeColor(SurfCol, col);
        CTool->SetColor(aLabelForStyle, col, XCAFDoc_ColorSurf);
      }
      if (!BoundCol.IsNull()) {
        Quantity_Color col;
        Styles.DecodeColor(BoundCol, col);
        CTool->SetColor(aLabelForStyle, col, XCAFDoc_ColorCurv);
      }
      if (!CurveCol.IsNull()) {
        Quantity_Color col;
        Styles.DecodeColor(CurveCol, col);
        CTool->SetColor(aLabelForStyle, col, XCAFDoc_ColorCurv);
      }
      if (!IsVisible)
        // sets the invisibility for shape.
        CTool->SetVisibility(aLabelForStyle, Standard_False);

    } // end search SHUO by SDR
  } // end iterates on styles

  return Standard_True;
}

//=======================================================================
//function : GetMassConversionFactor
//purpose  : 
//=======================================================================
static Standard_Boolean GetMassConversionFactor(Handle(StepBasic_NamedUnit)& NU,
  Standard_Real& afact)
{
  afact = 1.;
  if (!NU->IsKind(STANDARD_TYPE(StepBasic_ConversionBasedUnitAndMassUnit))) return Standard_False;
  Handle(StepBasic_ConversionBasedUnitAndMassUnit) CBUMU =
    Handle(StepBasic_ConversionBasedUnitAndMassUnit)::DownCast(NU);
  Handle(StepBasic_MeasureWithUnit) MWUCBU = CBUMU->ConversionFactor();
  afact = MWUCBU->ValueComponent();
  StepBasic_Unit anUnit2 = MWUCBU->UnitComponent();
  if (anUnit2.CaseNum(anUnit2.Value()) == 1) {
    Handle(StepBasic_NamedUnit) NU2 = anUnit2.NamedUnit();
    if (NU2->IsKind(STANDARD_TYPE(StepBasic_SiUnit))) {
      Handle(StepBasic_SiUnit) SU = Handle(StepBasic_SiUnit)::DownCast(NU2);
      if (SU->Name() == StepBasic_sunGram) {
        if (SU->HasPrefix())
          afact *= STEPConstruct_UnitContext::ConvertSiPrefix(SU->Prefix());
      }
    }
  }
  return Standard_True;
}

//=======================================================================
//function : readPMIPresentation
//purpose  : read polyline or tessellated presentation for 
// (Annotation_Curve_Occurrence or Draughting_Callout)
//=======================================================================
Standard_Boolean readPMIPresentation(const Handle(Standard_Transient)& thePresentEntity,
  const Handle(XSControl_TransferReader)& theTR,
  const Standard_Real theFact,
  TopoDS_Shape& thePresentation,
  Handle(TCollection_HAsciiString)& thePresentName,
  Bnd_Box& theBox)
{
  if (thePresentEntity.IsNull())
    return Standard_False;
  Handle(Transfer_TransientProcess) aTP = theTR->TransientProcess();
  Handle(StepVisual_AnnotationOccurrence) anAO;
  NCollection_Vector<Handle(StepVisual_StyledItem)> anAnnotations;
  if (thePresentEntity->IsKind(STANDARD_TYPE(StepVisual_AnnotationOccurrence)))
  {
    anAO = Handle(StepVisual_AnnotationOccurrence)::DownCast(thePresentEntity);
    if (!anAO.IsNull()) {
      thePresentName = anAO->Name();
      anAnnotations.Append(anAO);
    }
  }
  else if (thePresentEntity->IsKind(STANDARD_TYPE(StepVisual_DraughtingCallout)))
  {
    Handle(StepVisual_DraughtingCallout) aDCallout =
      Handle(StepVisual_DraughtingCallout)::DownCast(thePresentEntity);
    thePresentName = aDCallout->Name();
    for (Standard_Integer i = 1; i <= aDCallout->NbContents() && anAO.IsNull(); i++) {
      anAO = Handle(StepVisual_AnnotationOccurrence)::DownCast(aDCallout->ContentsValue(i).Value());
      if (!anAO.IsNull())
      {
        anAnnotations.Append(anAO);
        continue;
      }
      Handle(StepVisual_TessellatedAnnotationOccurrence) aTesselation =
        aDCallout->ContentsValue(i).TessellatedAnnotationOccurrence();
      if (!aTesselation.IsNull())
        anAnnotations.Append(aTesselation);
    }
  }

  if (!anAnnotations.Length())
    return Standard_False;


  BRep_Builder aB;
  TopoDS_Compound aResAnnotation;
  aB.MakeCompound(aResAnnotation);

  Standard_Integer i = 0;
  Bnd_Box aBox;
  Standard_Integer nbShapes = 0;
  for (; i < anAnnotations.Length(); i++)
  {
    Handle(StepVisual_StyledItem) anItem = anAnnotations(i);
    anAO = Handle(StepVisual_AnnotationOccurrence)::DownCast(anItem);
    TopoDS_Shape anAnnotationShape;
    if (!anAO.IsNull())
    {
      Handle(StepRepr_RepresentationItem) aCurveItem = anAO->Item();
      anAnnotationShape = STEPConstruct::FindShape(aTP, aCurveItem);
      if (anAnnotationShape.IsNull())
      {
        Handle(Transfer_Binder) binder = theTR->Actor()->Transfer(aCurveItem, aTP);
        if (!binder.IsNull() && binder->HasResult()) {
          anAnnotationShape = TransferBRep::ShapeResult(aTP, binder);
        }
      }
    }
    //case of tessellated entities
    else
    {
      Handle(StepRepr_RepresentationItem) aTessItem = anItem->Item();
      if (aTessItem.IsNull())
        continue;
      Handle(StepVisual_TessellatedGeometricSet) aTessSet = Handle(StepVisual_TessellatedGeometricSet)::DownCast(aTessItem);
      if (aTessSet.IsNull())
        continue;
      NCollection_Handle<StepVisual_Array1OfTessellatedItem> aListItems = aTessSet->Items();
      Standard_Integer nb = aListItems.IsNull() ? 0 : aListItems->Length();
      Handle(StepVisual_TessellatedCurveSet) aTessCurve;
      for (Standard_Integer n = 1; n <= nb && aTessCurve.IsNull(); n++)
      {
        aTessCurve = Handle(StepVisual_TessellatedCurveSet)::DownCast(aListItems->Value(n));
      }
      if (aTessCurve.IsNull())
        continue;
      Handle(StepVisual_CoordinatesList) aCoordList = aTessCurve->CoordList();
      if (aCoordList.IsNull())
        continue;
      Handle(TColgp_HArray1OfXYZ)  aPoints = aCoordList->Points();

      if (aPoints.IsNull() || aPoints->Length() == 0)
        continue;
      NCollection_Handle<StepVisual_VectorOfHSequenceOfInteger> aCurves = aTessCurve->Curves();
      Standard_Integer aNbC = (aCurves.IsNull() ? 0 : aCurves->Length());
      TopoDS_Compound aComp;
      aB.MakeCompound(aComp);

      Standard_Integer k = 0;
      for (; k < aNbC; k++)
      {
        Handle(TColStd_HSequenceOfInteger) anIndexes = aCurves->Value(k);
        TopoDS_Wire aCurW;
        aB.MakeWire(aCurW);

        for (Standard_Integer n = 1; n < anIndexes->Length(); n++)
        {
          Standard_Integer ind = anIndexes->Value(n);
          Standard_Integer indnext = anIndexes->Value(n + 1);
          if (ind > aPoints->Length() || indnext > aPoints->Length())
            continue;
          gp_Pnt aP1(aPoints->Value(ind) * theFact);
          gp_Pnt aP2(aPoints->Value(indnext) * theFact);
          BRepBuilderAPI_MakeEdge aMaker(aP1, aP2);
          if (aMaker.IsDone())
          {
            TopoDS_Edge aCurE = aMaker.Edge();
            aB.Add(aCurW, aCurE);
          }
        }
        aB.Add(aComp, aCurW);
      }
      anAnnotationShape = aComp;
    }
    if (!anAnnotationShape.IsNull())
    {
      nbShapes++;
      aB.Add(aResAnnotation, anAnnotationShape);
      if (i == anAnnotations.Length() - 1)
        BRepBndLib::AddClose(anAnnotationShape, aBox);
    }
  }

  thePresentation = aResAnnotation;
  theBox = aBox;
  return (nbShapes > 0);
}

//=======================================================================
//function : readAnnotationPlane
//purpose  : read annotation plane
//=======================================================================
Standard_Boolean readAnnotationPlane(const Handle(StepVisual_AnnotationPlane) theAnnotationPlane,
  gp_Ax2& thePlane)
{
  if (theAnnotationPlane.IsNull())
    return Standard_False;
  Handle(StepRepr_RepresentationItem) aPlaneItem = theAnnotationPlane->Item();
  if (aPlaneItem.IsNull())
    return Standard_False;
  Handle(StepGeom_Axis2Placement3d) aA2P3D;
  //retrieve axes from AnnotationPlane
  if (aPlaneItem->IsKind(STANDARD_TYPE(StepGeom_Plane))) {
    Handle(StepGeom_Plane) aPlane = Handle(StepGeom_Plane)::DownCast(aPlaneItem);
    aA2P3D = aPlane->Position();
  }
  else if (aPlaneItem->IsKind(STANDARD_TYPE(StepVisual_PlanarBox))) {
    Handle(StepVisual_PlanarBox) aBox = Handle(StepVisual_PlanarBox)::DownCast(aPlaneItem);
    aA2P3D = aBox->Placement().Axis2Placement3d();
  }
  if (aA2P3D.IsNull())
    return Standard_False;

  Handle(Geom_Axis2Placement) anAxis = StepToGeom::MakeAxis2Placement(aA2P3D);
  thePlane = anAxis->Ax2();
  return Standard_True;
}

//=======================================================================
//function : readAnnotation
//purpose  : read annotation plane and position for given GDT
// (Dimension, Geometric_Tolerance, Datum_Feature or Placed_Datum_Target_Feature)
//=======================================================================
void readAnnotation(const Handle(XSControl_TransferReader)& theTR,
  const Handle(Standard_Transient)& theGDT,
  const Handle(Standard_Transient)& theDimObject)
{
  if (theGDT.IsNull() || theDimObject.IsNull())
    return;
  Handle(TCollection_HAsciiString) aPresentName;
  TopoDS_Compound aResAnnotation;
  Handle(Transfer_TransientProcess) aTP = theTR->TransientProcess();
  const Interface_Graph& aGraph = aTP->Graph();
  // find the proper DraughtingModelItemAssociation
  Interface_EntityIterator subs = aGraph.Sharings(theGDT);
  Handle(StepAP242_DraughtingModelItemAssociation) aDMIA;
  for (subs.Start(); subs.More() && aDMIA.IsNull(); subs.Next()) {
    if (!subs.Value()->IsKind(STANDARD_TYPE(StepAP242_DraughtingModelItemAssociation)))
      continue;
    aDMIA = Handle(StepAP242_DraughtingModelItemAssociation)::DownCast(subs.Value());
    Handle(TCollection_HAsciiString) aName = aDMIA->Name();
    aName->LowerCase();
    if (!aName->Search(new TCollection_HAsciiString("pmi representation to presentation link"))) {
      aDMIA = NULL;
    }
  }
  if (aDMIA.IsNull() || aDMIA->NbIdentifiedItem() == 0)
    return;

  // calculate units
  Handle(StepVisual_DraughtingModel) aDModel =
    Handle(StepVisual_DraughtingModel)::DownCast(aDMIA->UsedRepresentation());
  XSAlgo::AlgoContainer()->PrepareForTransfer();
  STEPControl_ActorRead anActor;
  anActor.PrepareUnits(aDModel, aTP);
  Standard_Real aFact = UnitsMethods::LengthFactor();

  // retrieve AnnotationPlane
  Handle(StepRepr_RepresentationItem) aDMIAE = aDMIA->IdentifiedItemValue(1);
  if (aDMIAE.IsNull())
    return;
  gp_Ax2 aPlaneAxes;
  subs = aGraph.Sharings(aDMIAE);
  Handle(StepVisual_AnnotationPlane) anAnPlane;
  for (subs.Start(); subs.More() && anAnPlane.IsNull(); subs.Next()) {
    anAnPlane = Handle(StepVisual_AnnotationPlane)::DownCast(subs.Value());
  }
  Standard_Boolean isHasPlane = readAnnotationPlane(anAnPlane, aPlaneAxes);

  // set plane axes to XCAF
  if (isHasPlane) {
    if (theDimObject->IsKind(STANDARD_TYPE(XCAFDimTolObjects_DimensionObject))) {
      Handle(XCAFDimTolObjects_DimensionObject) anObj =
        Handle(XCAFDimTolObjects_DimensionObject)::DownCast(theDimObject);
      Handle(TColgp_HArray1OfPnt) aPnts = new TColgp_HArray1OfPnt(1, 1);
      anObj->SetPlane(aPlaneAxes);
    }
    else if (theDimObject->IsKind(STANDARD_TYPE(XCAFDimTolObjects_DatumObject))) {
      Handle(XCAFDimTolObjects_DatumObject) anObj =
        Handle(XCAFDimTolObjects_DatumObject)::DownCast(theDimObject);
      anObj->SetPlane(aPlaneAxes);
    }
    else if (theDimObject->IsKind(STANDARD_TYPE(XCAFDimTolObjects_GeomToleranceObject))) {
      Handle(XCAFDimTolObjects_GeomToleranceObject) anObj =
        Handle(XCAFDimTolObjects_GeomToleranceObject)::DownCast(theDimObject);
      anObj->SetPlane(aPlaneAxes);
    }
  }

  // Retrieve presentation
  Bnd_Box aBox;
  if (!readPMIPresentation(aDMIAE, theTR, aFact, aResAnnotation, aPresentName, aBox))
    return;
  gp_Pnt aPtext(0., 0., 0.);
  // if Annotation plane location inside bounding box set it to text position
  // else set the center of bounding box to text position 0027372
  if (!aBox.IsVoid())
  {
    Standard_Real aXmin, aYmin, aZmin, aXmax, aYmax, aZmax;
    aBox.Get(aXmin, aYmin, aZmin, aXmax, aYmax, aZmax);
    if (isHasPlane && !aBox.IsOut(aPlaneAxes.Location())) {
      aPtext = aPlaneAxes.Location();
    }
    else {
      aPtext = gp_Pnt((aXmin + aXmax) * 0.5, (aYmin + aYmax) * 0.5, (aZmin + aZmax) * 0.5);
    }
  }
  else {
    aPtext = aPlaneAxes.Location();
  }

  // set point to XCAF
  if (theDimObject->IsKind(STANDARD_TYPE(XCAFDimTolObjects_DimensionObject))) {
    Handle(XCAFDimTolObjects_DimensionObject) anObj =
      Handle(XCAFDimTolObjects_DimensionObject)::DownCast(theDimObject);
    anObj->SetPointTextAttach(aPtext);
    anObj->SetPresentation(aResAnnotation, aPresentName);
  }
  else if (theDimObject->IsKind(STANDARD_TYPE(XCAFDimTolObjects_DatumObject))) {
    Handle(XCAFDimTolObjects_DatumObject) anObj =
      Handle(XCAFDimTolObjects_DatumObject)::DownCast(theDimObject);
    anObj->SetPointTextAttach(aPtext);
    anObj->SetPresentation(aResAnnotation, aPresentName);
  }
  else if (theDimObject->IsKind(STANDARD_TYPE(XCAFDimTolObjects_GeomToleranceObject))) {
    Handle(XCAFDimTolObjects_GeomToleranceObject) anObj =
      Handle(XCAFDimTolObjects_GeomToleranceObject)::DownCast(theDimObject);
    anObj->SetPointTextAttach(aPtext);
    anObj->SetPresentation(aResAnnotation, aPresentName);
  }
  return;
}

//=======================================================================
//function : readConnectionPoints
//purpose  : read connection points for given dimension
//=======================================================================
void readConnectionPoints(const Handle(XSControl_TransferReader)& theTR,
  const Handle(Standard_Transient) theGDT,
  const Handle(XCAFDimTolObjects_DimensionObject)& theDimObject)
{
  if (theGDT.IsNull() || theDimObject.IsNull())
    return;
  Handle(Transfer_TransientProcess) aTP = theTR->TransientProcess();
  const Interface_Graph& aGraph = aTP->Graph();

  
  Standard_Real aFact = 1.;

  Handle(StepShape_ShapeDimensionRepresentation) aSDR = NULL;
  for (Interface_EntityIterator anIt = aGraph.Sharings(theGDT); aSDR.IsNull() && anIt.More(); anIt.Next()) {
    Handle(Standard_Transient) anEnt = anIt.Value();
    Handle(StepShape_DimensionalCharacteristicRepresentation) aDCR =
      Handle(StepShape_DimensionalCharacteristicRepresentation)::DownCast(anEnt);
    if (!aDCR.IsNull())
      aSDR = !aDCR.IsNull() ? aDCR->Representation() : Handle(StepShape_ShapeDimensionRepresentation)::DownCast(anEnt);
  }
  if (!aSDR.IsNull())
  {
    XSAlgo::AlgoContainer()->PrepareForTransfer();
    STEPControl_ActorRead anActor;
    anActor.PrepareUnits(aSDR, aTP);
    aFact = UnitsMethods::LengthFactor();
  }
  
  if (theGDT->IsKind(STANDARD_TYPE(StepShape_DimensionalSize))) {
    // retrieve derived geometry
    Handle(StepShape_DimensionalSize) aDim = Handle(StepShape_DimensionalSize)::DownCast(theGDT);
    Handle(StepRepr_DerivedShapeAspect) aDSA = Handle(StepRepr_DerivedShapeAspect)::DownCast(aDim->AppliesTo());
    if (aDSA.IsNull())
      return;
    Handle(StepAP242_GeometricItemSpecificUsage) aGISU = NULL;
    for (Interface_EntityIterator anIt = aGraph.Sharings(aDSA); aGISU.IsNull() && anIt.More(); anIt.Next()) {
      aGISU = Handle(StepAP242_GeometricItemSpecificUsage)::DownCast(anIt.Value());
    }
    if (aGISU.IsNull() || aGISU->NbIdentifiedItem() == 0)
      return;
    Handle(StepGeom_CartesianPoint) aPoint = Handle(StepGeom_CartesianPoint)::DownCast(aGISU->IdentifiedItem()->Value(1));
    if (aPoint.IsNull()) {
      // try Axis2Placement3d.location instead of CartesianPoint
      Handle(StepGeom_Axis2Placement3d) anA2P3D =
        Handle(StepGeom_Axis2Placement3d)::DownCast(aGISU->IdentifiedItem()->Value(1));
      if (anA2P3D.IsNull())
        return;
      aPoint = anA2P3D->Location();
    }

    // set connection point to object
    gp_Pnt aPnt(aPoint->CoordinatesValue(1) * aFact, aPoint->CoordinatesValue(2) * aFact, aPoint->CoordinatesValue(3) * aFact);
    theDimObject->SetPoint(aPnt);
  }
  else if (theGDT->IsKind(STANDARD_TYPE(StepShape_DimensionalLocation))) {
    // retrieve derived geometry
    Handle(StepShape_DimensionalLocation) aDim = Handle(StepShape_DimensionalLocation)::DownCast(theGDT);
    Handle(StepRepr_DerivedShapeAspect) aDSA1 = Handle(StepRepr_DerivedShapeAspect)::DownCast(aDim->RelatingShapeAspect());
    Handle(StepRepr_DerivedShapeAspect) aDSA2 = Handle(StepRepr_DerivedShapeAspect)::DownCast(aDim->RelatedShapeAspect());
    if (aDSA1.IsNull() && aDSA2.IsNull())
      return;
    Handle(StepAP242_GeometricItemSpecificUsage) aGISU1 = NULL;
    Handle(StepAP242_GeometricItemSpecificUsage) aGISU2 = NULL;
    if (!aDSA1.IsNull()) {
      for (Interface_EntityIterator anIt = aGraph.Sharings(aDSA1); aGISU1.IsNull() && anIt.More(); anIt.Next()) {
        aGISU1 = Handle(StepAP242_GeometricItemSpecificUsage)::DownCast(anIt.Value());
      }
    }
    if (!aDSA2.IsNull()) {
      for (Interface_EntityIterator anIt = aGraph.Sharings(aDSA2); aGISU2.IsNull() && anIt.More(); anIt.Next()) {
        aGISU2 = Handle(StepAP242_GeometricItemSpecificUsage)::DownCast(anIt.Value());
      }
    }
    // first point
    if (!aGISU1.IsNull() && aGISU1->NbIdentifiedItem() > 0) {
      Handle(StepGeom_CartesianPoint) aPoint = Handle(StepGeom_CartesianPoint)::DownCast(aGISU1->IdentifiedItem()->Value(1));
      if (aPoint.IsNull()) {
        // try Axis2Placement3d.location instead of CartesianPoint
        Handle(StepGeom_Axis2Placement3d) anA2P3D =
          Handle(StepGeom_Axis2Placement3d)::DownCast(aGISU1->IdentifiedItem()->Value(1));
        if (!anA2P3D.IsNull())
          aPoint = anA2P3D->Location();
      }
      if (!aPoint.IsNull()) {
        // set connection point to object
        gp_Pnt aPnt(aPoint->CoordinatesValue(1) * aFact, aPoint->CoordinatesValue(2) * aFact, aPoint->CoordinatesValue(3) * aFact);
        theDimObject->SetPoint(aPnt);
      }
    }
    // second point
    if (!aGISU2.IsNull() && aGISU2->NbIdentifiedItem() > 0) {
      Handle(StepGeom_CartesianPoint) aPoint = Handle(StepGeom_CartesianPoint)::DownCast(aGISU2->IdentifiedItem()->Value(1));
      if (aPoint.IsNull()) {
        // try Axis2Placement3d.location instead of CartesianPoint
        Handle(StepGeom_Axis2Placement3d) anA2P3D =
          Handle(StepGeom_Axis2Placement3d)::DownCast(aGISU2->IdentifiedItem()->Value(1));
        if (!anA2P3D.IsNull())
          aPoint = anA2P3D->Location();
      }
      if (!aPoint.IsNull()) {
        // set connection point to object
        gp_Pnt aPnt(aPoint->CoordinatesValue(1) * aFact, aPoint->CoordinatesValue(2) * aFact, aPoint->CoordinatesValue(3) * aFact);
        theDimObject->SetPoint2(aPnt);
      }
    }
  }
}

//=======================================================================
//function : ReadDatums
//purpose  : auxilary
//=======================================================================
static Standard_Boolean ReadDatums(const Handle(XCAFDoc_ShapeTool) &STool,
  const Handle(XCAFDoc_DimTolTool) &DGTTool,
  const Interface_Graph &graph,
  const Handle(Transfer_TransientProcess) &TP,
  const TDF_Label TolerL,
  const Handle(StepDimTol_GeometricToleranceWithDatumReference) GTWDR)
{
  if (GTWDR.IsNull()) return Standard_False;
  Handle(StepDimTol_HArray1OfDatumReference) HADR = GTWDR->DatumSystem();
  if (HADR.IsNull()) return Standard_False;
  for (Standard_Integer idr = 1; idr <= HADR->Length(); idr++) {
    Handle(StepDimTol_DatumReference) DR = HADR->Value(idr);
    Handle(StepDimTol_Datum) aDatum = DR->ReferencedDatum();
    if (aDatum.IsNull()) continue;
    Interface_EntityIterator subs4 = graph.Sharings(aDatum);
    for (subs4.Start(); subs4.More(); subs4.Next()) {
      Handle(StepRepr_ShapeAspectRelationship) SAR =
        Handle(StepRepr_ShapeAspectRelationship)::DownCast(subs4.Value());
      if (SAR.IsNull()) continue;
      Handle(StepDimTol_DatumFeature) DF =
        Handle(StepDimTol_DatumFeature)::DownCast(SAR->RelatingShapeAspect());
      if (DF.IsNull()) continue;
      Interface_EntityIterator subs5 = graph.Sharings(DF);
      Handle(StepRepr_PropertyDefinition) PropDef;
      for (subs5.Start(); subs5.More() && PropDef.IsNull(); subs5.Next()) {
        PropDef = Handle(StepRepr_PropertyDefinition)::DownCast(subs5.Value());
      }
      if (PropDef.IsNull()) continue;
      Handle(StepShape_AdvancedFace) AF;
      subs5 = graph.Sharings(PropDef);
      for (subs5.Start(); subs5.More(); subs5.Next()) {
        Handle(StepShape_ShapeDefinitionRepresentation) SDR =
          Handle(StepShape_ShapeDefinitionRepresentation)::DownCast(subs5.Value());
        if (!SDR.IsNull()) {
          Handle(StepRepr_Representation) Repr = SDR->UsedRepresentation();
          if (!Repr.IsNull() && Repr->NbItems() > 0) {
            Handle(StepRepr_RepresentationItem) RI = Repr->ItemsValue(1);
            AF = Handle(StepShape_AdvancedFace)::DownCast(RI);
          }
        }
      }
      if (AF.IsNull()) return Standard_False;
      Standard_Integer index = TP->MapIndex(AF);
      TopoDS_Shape aSh;
      if (index > 0) {
        Handle(Transfer_Binder) binder = TP->MapItem(index);
        aSh = TransferBRep::ShapeResult(binder);
      }
      if (aSh.IsNull()) continue;
      TDF_Label shL;
      if (!STool->Search(aSh, shL, Standard_True, Standard_True, Standard_True)) continue;
      DGTTool->SetDatum(shL, TolerL, PropDef->Name(), PropDef->Description(), aDatum->Identification());
    }
  }
  return Standard_True;
}

//=======================================================================
//function : FindShapeIndexForDGT
//purpose  : auxiliary find shape index in map og imported shapes
//=======================================================================
static Standard_Integer FindShapeIndexForDGT(const Handle(Standard_Transient)& theEnt,
  const Handle(XSControl_WorkSession)& theWS)
{
  const Handle(Transfer_TransientProcess) &aTP = theWS->TransferReader()->TransientProcess();
  // try to find index of given entity
  Standard_Integer anIndex = aTP->MapIndex(theEnt);
  if (anIndex > 0)
    return anIndex;
  // if theEnt is a geometry item try to find its topological item
  const Interface_Graph& aGraph = aTP->Graph();
  Interface_EntityIterator anIter = aGraph.Sharings(theEnt);
  for (anIter.Start(); anIter.More(); anIter.Next()) {
    if (anIter.Value()->IsKind(STANDARD_TYPE(StepShape_TopologicalRepresentationItem)))
    {
      anIndex = aTP->MapIndex(anIter.Value());
      if (anIndex > 0)
        return anIndex;
    }
  }
  return 0;
}

//=======================================================================
//function : collectShapeAspect
//purpose  : 
//=======================================================================
static void collectShapeAspect(const Handle(StepRepr_ShapeAspect)& theSA,
  const Handle(XSControl_WorkSession)& theWS,
  NCollection_Sequence<Handle(StepRepr_ShapeAspect)>& theSAs)
{
  if (theSA.IsNull())
    return;
  Handle(XSControl_TransferReader) aTR = theWS->TransferReader();
  Handle(Transfer_TransientProcess) aTP = aTR->TransientProcess();
  const Interface_Graph& aGraph = aTP->Graph();
  // Retrieve Shape_Aspect, connected to Representation_Item from Derived_Shape_Aspect
  if (theSA->IsKind(STANDARD_TYPE(StepRepr_DerivedShapeAspect))) {
    Interface_EntityIterator anIter = aGraph.Sharings(theSA);
    Handle(StepRepr_ShapeAspectDerivingRelationship) aSADR = NULL;
    for (; aSADR.IsNull() && anIter.More(); anIter.Next()) {
      aSADR = Handle(StepRepr_ShapeAspectDerivingRelationship)::DownCast(anIter.Value());
    }
    if (!aSADR.IsNull())
      collectShapeAspect(aSADR->RelatedShapeAspect(), theWS, theSAs);
  }
  else if (theSA->IsKind(STANDARD_TYPE(StepDimTol_DatumFeature)) ||
    theSA->IsKind(STANDARD_TYPE(StepDimTol_DatumTarget))) {
    theSAs.Append(theSA);
    return;
  }
  else {
    // Find all children Shape_Aspect
    Standard_Boolean isSimple = Standard_True;
    Interface_EntityIterator anIter = aGraph.Sharings(theSA);
    for (; anIter.More(); anIter.Next()) {
      if (anIter.Value()->IsKind(STANDARD_TYPE(StepRepr_ShapeAspectRelationship)) &&
        !anIter.Value()->IsKind(STANDARD_TYPE(StepShape_DimensionalLocation))) {
        Handle(StepRepr_ShapeAspectRelationship) aSAR =
          Handle(StepRepr_ShapeAspectRelationship)::DownCast(anIter.Value());
        if (aSAR->RelatingShapeAspect() == theSA && !aSAR->RelatedShapeAspect().IsNull()
          && !aSAR->RelatedShapeAspect()->IsKind(STANDARD_TYPE(StepDimTol_Datum))) {
          collectShapeAspect(aSAR->RelatedShapeAspect(), theWS, theSAs);
          isSimple = Standard_False;
        }
      }
    }
    // If not Composite_Shape_Aspect (or subtype) append to sequence.
    if (isSimple)
      theSAs.Append(theSA);
  }
}

//=======================================================================
//function : getShapeLabel
//purpose  : 
//=======================================================================

static TDF_Label getShapeLabel(const Handle(StepRepr_RepresentationItem)& theItem,
  const Handle(XSControl_WorkSession)& theWS,
  const Handle(XCAFDoc_ShapeTool)& theShapeTool)
{
  TDF_Label aShapeL;
  const Handle(Transfer_TransientProcess) &aTP = theWS->TransferReader()->TransientProcess();
  Standard_Integer index = FindShapeIndexForDGT(theItem, theWS);
  TopoDS_Shape aShape;
  if (index > 0) {
    Handle(Transfer_Binder) aBinder = aTP->MapItem(index);
    aShape = TransferBRep::ShapeResult(aBinder);
  }
  if (aShape.IsNull())
    return aShapeL;
  theShapeTool->Search(aShape, aShapeL, Standard_True, Standard_True, Standard_True);
  return aShapeL;
}

//=======================================================================
//function : setDatumToXCAF
//purpose  : 
//=======================================================================

Standard_Boolean STEPCAFControl_Reader::setDatumToXCAF(const Handle(StepDimTol_Datum)& theDat,
  const TDF_Label theGDTL,
  const Standard_Integer thePositionCounter,
  const XCAFDimTolObjects_DatumModifiersSequence& theXCAFModifiers,
  const XCAFDimTolObjects_DatumModifWithValue theXCAFModifWithVal,
  const Standard_Real theModifValue,
  const Handle(TDocStd_Document)& theDoc,
  const Handle(XSControl_WorkSession)& theWS)
{
  Handle(XCAFDoc_ShapeTool) aSTool = XCAFDoc_DocumentTool::ShapeTool(theDoc->Main());
  Handle(XCAFDoc_DimTolTool) aDGTTool = XCAFDoc_DocumentTool::DimTolTool(theDoc->Main());
  const Handle(XSControl_TransferReader) &aTR = theWS->TransferReader();
  const Handle(Transfer_TransientProcess) &aTP = aTR->TransientProcess();
  const Interface_Graph& aGraph = aTP->Graph();
  Handle(XCAFDoc_Datum) aDat;
  TDF_LabelSequence aShapeLabels;
  Handle(XCAFDimTolObjects_DatumObject) aDatObj = new XCAFDimTolObjects_DatumObject();

  // Collect all links to shapes
  NCollection_Sequence<Handle(StepRepr_ShapeAspect)> aSAs;
  Interface_EntityIterator anIterD = aGraph.Sharings(theDat);
  for (anIterD.Start(); anIterD.More(); anIterD.Next()) {
    Handle(StepRepr_ShapeAspectRelationship) aSAR = Handle(StepRepr_ShapeAspectRelationship)::DownCast(anIterD.Value());
    if (aSAR.IsNull() || aSAR->RelatingShapeAspect().IsNull())
      continue;
    collectShapeAspect(aSAR->RelatingShapeAspect(), theWS, aSAs);
    Handle(StepDimTol_DatumFeature) aDF = Handle(StepDimTol_DatumFeature)::DownCast(aSAR->RelatingShapeAspect());
    if (!aSAR->RelatingShapeAspect()->IsKind(STANDARD_TYPE(StepDimTol_DatumTarget)))
      readAnnotation(aTR, aSAR->RelatingShapeAspect(), aDatObj);
  }

  // Collect shape labels
  for (Standard_Integer i = 1; i <= aSAs.Length(); i++) {
    Handle(StepRepr_ShapeAspect) aSA = aSAs.Value(i);
    if (aSA.IsNull())
      continue;
    // Skip datum targets
    if (aSA->IsKind(STANDARD_TYPE(StepDimTol_DatumTarget)))
      continue;

    // Process all connected GISU
    Interface_EntityIterator anIter = aGraph.Sharings(aSA);
    for (; anIter.More(); anIter.Next()) {
      Handle(StepAP242_GeometricItemSpecificUsage) aGISU = Handle(StepAP242_GeometricItemSpecificUsage)::DownCast(anIter.Value());
      if (aGISU.IsNull())
        continue;
      for (Standard_Integer j = 1; j <= aGISU->NbIdentifiedItem(); j++) {
        TDF_Label aShapeL = getShapeLabel(aGISU->IdentifiedItemValue(j), theWS, aSTool);
        if (!aShapeL.IsNull())
          aShapeLabels.Append(aShapeL);
      }
    }
  }

  // Process datum targets and create objects for them
  Standard_Boolean isExistDatumTarget = Standard_False;
  for (Standard_Integer i = 1; i <= aSAs.Length(); i++) {
    Handle(StepDimTol_PlacedDatumTargetFeature) aDT = Handle(StepDimTol_PlacedDatumTargetFeature)::DownCast(aSAs.Value(i));
    if (aDT.IsNull())
      continue;
    Handle(XCAFDimTolObjects_DatumObject) aDatTargetObj = new XCAFDimTolObjects_DatumObject();
    XCAFDimTolObjects_DatumTargetType aType;
    if (!STEPCAFControl_GDTProperty::GetDatumTargetType(aDT->Description(), aType))
      continue;
    aDatTargetObj->SetDatumTargetType(aType);
    Standard_Boolean isValidDT = Standard_False;

    // Feature for datum target
    TDF_LabelSequence aDTShapeLabels;
    Interface_EntityIterator aDTIter = aGraph.Sharings(aDT);
    Handle(StepRepr_FeatureForDatumTargetRelationship) aRelationship;
    for (; aDTIter.More() && aRelationship.IsNull(); aDTIter.Next()) {
      aRelationship = Handle(StepRepr_FeatureForDatumTargetRelationship)::DownCast(aDTIter.Value());
    }
    if (!aRelationship.IsNull()) {
      Handle(StepRepr_ShapeAspect) aSA = aRelationship->RelatingShapeAspect();
      Interface_EntityIterator aSAIter = aGraph.Sharings(aSA);
      for (; aSAIter.More(); aSAIter.Next()) {
        Handle(StepAP242_GeometricItemSpecificUsage) aGISU = Handle(StepAP242_GeometricItemSpecificUsage)::DownCast(aSAIter.Value());
        if (aGISU.IsNull())
          continue;
        for (Standard_Integer j = 1; j <= aGISU->NbIdentifiedItem(); j++) {
          TDF_Label aShapeL = getShapeLabel(aGISU->IdentifiedItemValue(j), theWS, aSTool);
          if (!aShapeL.IsNull()) {
            aDTShapeLabels.Append(aShapeL);
            isValidDT = Standard_True;
          }
        }
      }
    }

    if (aType != XCAFDimTolObjects_DatumTargetType_Area && !isValidDT) {
      // Try another way of feature connection
      for (aDTIter.Start(); aDTIter.More(); aDTIter.Next()) {
        Handle(StepAP242_GeometricItemSpecificUsage) aGISU = Handle(StepAP242_GeometricItemSpecificUsage)::DownCast(aDTIter.Value());
        if (aGISU.IsNull())
          continue;
        for (Standard_Integer j = 1; j <= aGISU->NbIdentifiedItem(); j++) {
          TDF_Label aShapeL = getShapeLabel(aGISU->IdentifiedItemValue(j), theWS, aSTool);
          if (!aShapeL.IsNull()) {
            aDTShapeLabels.Append(aShapeL);
            isValidDT = Standard_True;
          }
        }
      }
    }

    if (aType == XCAFDimTolObjects_DatumTargetType_Area) {
      // Area datum target
      Interface_EntityIterator anIterDTF = aGraph.Shareds(aDT);
      Handle(StepAP242_GeometricItemSpecificUsage) aGISU;
      for (; anIterDTF.More() && aGISU.IsNull(); anIterDTF.Next()) {
        aGISU = Handle(StepAP242_GeometricItemSpecificUsage)::DownCast(anIterDTF.Value());
      }
      Handle(StepRepr_RepresentationItem) anItem;
      if (aGISU->NbIdentifiedItem() > 0)
        anItem = aGISU->IdentifiedItemValue(1);
      if (anItem.IsNull())
        continue;
      Standard_Integer anItemIndex = FindShapeIndexForDGT(anItem, theWS);
      if (anItemIndex > 0) {
        Handle(Transfer_Binder) aBinder = aTP->MapItem(anItemIndex);
        TopoDS_Shape anItemShape = TransferBRep::ShapeResult(aBinder);
        aDatTargetObj->SetDatumTarget(anItemShape);
        isValidDT = Standard_True;
      }
    }
    else {
      // Point/line/rectangle/circle datum targets 
      Interface_EntityIterator anIter = aGraph.Sharings(aDT);
      Handle(StepRepr_PropertyDefinition) aPD;
      for (; anIter.More() && aPD.IsNull(); anIter.Next()) {
        aPD = Handle(StepRepr_PropertyDefinition)::DownCast(anIter.Value());
      }
      if (!aPD.IsNull()) {
        anIter = aGraph.Sharings(aPD);
        Handle(StepShape_ShapeDefinitionRepresentation) aSDR;
        for (; anIter.More() && aSDR.IsNull(); anIter.Next()) {
          aSDR = Handle(StepShape_ShapeDefinitionRepresentation)::DownCast(anIter.Value());
        }
        if (!aSDR.IsNull()) {
          Handle(StepShape_ShapeRepresentationWithParameters) aSRWP
            = Handle(StepShape_ShapeRepresentationWithParameters)::DownCast(aSDR->UsedRepresentation());
          if (!aSRWP.IsNull()) {
            isValidDT = Standard_True;
            // Collect parameters of datum target
            for (Standard_Integer j = aSRWP->Items()->Lower(); j <= aSRWP->Items()->Upper(); j++)
            {
              if (aSRWP->ItemsValue(j).IsNull())
                continue;
              if (aSRWP->ItemsValue(j)->IsKind(STANDARD_TYPE(StepGeom_Axis2Placement3d)))
              {
                Handle(StepGeom_Axis2Placement3d) anAx
                  = Handle(StepGeom_Axis2Placement3d)::DownCast(aSRWP->ItemsValue(j));
                XSAlgo::AlgoContainer()->PrepareForTransfer();
                STEPControl_ActorRead anActor;
                anActor.PrepareUnits(aSRWP, aTP);
                Handle(Geom_Axis2Placement) anAxis = StepToGeom::MakeAxis2Placement(anAx);
                aDatTargetObj->SetDatumTargetAxis(anAxis->Ax2());
              }
              else if (aSRWP->ItemsValue(j)->IsKind(STANDARD_TYPE(StepRepr_ReprItemAndLengthMeasureWithUnit)))
              {
                Handle(StepRepr_ReprItemAndLengthMeasureWithUnit) aM =
                  Handle(StepRepr_ReprItemAndLengthMeasureWithUnit)::DownCast(aSRWP->ItemsValue(j));
                Standard_Real aVal = aM->GetMeasureWithUnit()->ValueComponent();
                StepBasic_Unit anUnit = aM->GetMeasureWithUnit()->UnitComponent();
                if (anUnit.IsNull())
                  continue;
                Handle(StepBasic_NamedUnit) aNU = anUnit.NamedUnit();
                if (aNU.IsNull())
                  continue;
                STEPConstruct_UnitContext anUnitCtx;
                anUnitCtx.ComputeFactors(aNU);
                aVal = aVal * anUnitCtx.LengthFactor();
                if (aM->Name()->String().IsEqual("target length") ||
                  aM->Name()->String().IsEqual("target diameter"))
                  aDatTargetObj->SetDatumTargetLength(aVal);
                else
                  aDatTargetObj->SetDatumTargetWidth(aVal);
              }
            }
          }
        }
      }
    }

    // Create datum target object
    if (isValidDT) {
      TDF_Label aDatL = aDGTTool->AddDatum();
      myGDTMap.Bind(aDT, aDatL);
      aDGTTool->Lock(aDatL);
      aDat = XCAFDoc_Datum::Set(aDatL);
      aDGTTool->SetDatum(aDTShapeLabels, aDatL);
      aDatTargetObj->SetName(theDat->Identification());
      aDatTargetObj->SetPosition(thePositionCounter);
      if (!theXCAFModifiers.IsEmpty())
        aDatTargetObj->SetModifiers(theXCAFModifiers);
      if (theXCAFModifWithVal != XCAFDimTolObjects_DatumModifWithValue_None)
        aDatTargetObj->SetModifierWithValue(theXCAFModifWithVal, theModifValue);
      aDGTTool->SetDatumToGeomTol(aDatL, theGDTL);
      aDatTargetObj->IsDatumTarget(Standard_True);
      aDatTargetObj->SetDatumTargetNumber(aDT->TargetId()->IntegerValue());
      readAnnotation(aTR, aDT, aDatTargetObj);
      aDat->SetObject(aDatTargetObj);
      isExistDatumTarget = Standard_True;
    }
  }

  if (aShapeLabels.Length() > 0 || !isExistDatumTarget) {
    // Create object for datum
    TDF_Label aDatL = aDGTTool->AddDatum();
    myGDTMap.Bind(theDat, aDatL);
    // bind datum label with all reference datum_feature entities
    for (Standard_Integer i = 1; i <= aSAs.Length(); i++) {
      Handle(StepRepr_ShapeAspect) aSA = aSAs.Value(i);
      if (aSA.IsNull() || aSA->IsKind(STANDARD_TYPE(StepDimTol_DatumTarget)))
        continue;
      myGDTMap.Bind(aSA, aDatL);
    }
    aDGTTool->Lock(aDatL);
    aDat = XCAFDoc_Datum::Set(aDatL);
    aDGTTool->SetDatum(aShapeLabels, aDatL);
    aDatObj->SetName(theDat->Identification());
    aDatObj->SetPosition(thePositionCounter);
    if (!theXCAFModifiers.IsEmpty())
      aDatObj->SetModifiers(theXCAFModifiers);
    if (theXCAFModifWithVal != XCAFDimTolObjects_DatumModifWithValue_None)
      aDatObj->SetModifierWithValue(theXCAFModifWithVal, theModifValue);
    aDGTTool->SetDatumToGeomTol(aDatL, theGDTL);
    if (aDatObj->GetPresentation().IsNull()) {
      // Try find annotation connected to datum entity (not right case, according recommended practices)
      readAnnotation(aTR, theDat, aDatObj);
    }
    aDat->SetObject(aDatObj);
  }

  return Standard_True;
}


//=======================================================================
//function : ReadDatums
//purpose  : auxilary
//=======================================================================
Standard_Boolean STEPCAFControl_Reader::readDatumsAP242(const Handle(Standard_Transient)& theEnt,
  const TDF_Label theGDTL,
  const Handle(TDocStd_Document)& theDoc,
  const Handle(XSControl_WorkSession)& theWS)
{
  const Handle(XSControl_TransferReader) &aTR = theWS->TransferReader();
  const Handle(Transfer_TransientProcess) &aTP = aTR->TransientProcess();
  const Interface_Graph& aGraph = aTP->Graph();

  Interface_EntityIterator anIter = aGraph.Shareds(theEnt);
  for (anIter.Start(); anIter.More(); anIter.Next()) {
    Handle(Standard_Transient) anAtr = anIter.Value();
    if (anAtr->IsKind(STANDARD_TYPE(StepDimTol_DatumSystem)))
    {
      Standard_Integer aPositionCounter = 0;//position on frame 
      Handle(StepDimTol_DatumSystem) aDS = Handle(StepDimTol_DatumSystem)::DownCast(anAtr);
      Interface_EntityIterator anIterDS = aGraph.Sharings(aDS);
      for (anIterDS.Start(); anIterDS.More(); anIterDS.Next()) {
        Handle(Standard_Transient) anAtrDS = anIterDS.Value();
        if (anAtrDS->IsKind(STANDARD_TYPE(StepAP242_GeometricItemSpecificUsage)))
        {
          //get axis
          Handle(StepAP242_GeometricItemSpecificUsage)aAxGISUI
            = Handle(StepAP242_GeometricItemSpecificUsage)::DownCast(anAtrDS);
          if (aAxGISUI->IdentifiedItemValue(1)->IsKind(STANDARD_TYPE(StepGeom_Axis2Placement3d)))
          {
            Handle(StepGeom_Axis2Placement3d) anAx
              = Handle(StepGeom_Axis2Placement3d)::DownCast(aAxGISUI->IdentifiedItemValue(1));
            Handle(XCAFDoc_GeomTolerance) aTol;
            if (theGDTL.FindAttribute(XCAFDoc_GeomTolerance::GetID(), aTol))
            {
              Handle(XCAFDimTolObjects_GeomToleranceObject) anObj = aTol->GetObject();
              Handle(TColStd_HArray1OfReal) aDirArr = anAx->Axis()->DirectionRatios();
              Handle(TColStd_HArray1OfReal) aDirRArr = anAx->RefDirection()->DirectionRatios();
              Handle(TColStd_HArray1OfReal) aLocArr = anAx->Location()->Coordinates();
              gp_Dir aDir;
              gp_Dir aDirR;
              gp_Pnt aPnt;
              if (!aDirArr.IsNull() && aDirArr->Length() > 2 &&
                !aDirRArr.IsNull() && aDirRArr->Length() > 2 &&
                !aLocArr.IsNull() && aLocArr->Length() > 2)
              {
                aDir.SetCoord(aDirArr->Lower(), aDirArr->Lower() + 1, aDirArr->Lower() + 2);
                aDirR.SetCoord(aDirRArr->Lower(), aDirRArr->Lower() + 1, aDirRArr->Lower() + 2);
                aPnt.SetCoord(aLocArr->Lower(), aLocArr->Lower() + 1, aLocArr->Lower() + 2);
                gp_Ax2 anA(aPnt, aDir, aDirR);
                anObj->SetAxis(anA);
                aTol->SetObject(anObj);
              }
            }
          }
        }
      }
      if (aDS->NbConstituents() > 0)
      {
        //get datum feature and datum target from datum system
        Handle(StepDimTol_HArray1OfDatumReferenceCompartment) aDRCA = aDS->Constituents();
        if (!aDRCA.IsNull())
        {
          for (Standard_Integer i = aDRCA->Lower(); i <= aDRCA->Upper(); i++)
          {
            Handle(StepDimTol_DatumReferenceCompartment) aDRC = aDRCA->Value(i);
            //gete modifiers
            Handle(StepDimTol_HArray1OfDatumReferenceModifier) aModif = aDRC->Modifiers();
            XCAFDimTolObjects_DatumModifiersSequence aXCAFModifiers;
            XCAFDimTolObjects_DatumModifWithValue aXCAFModifWithVal = XCAFDimTolObjects_DatumModifWithValue_None;
            Standard_Real aModifValue = 0;
            if (!aModif.IsNull())
            {
              for (Standard_Integer m = aModif->Lower(); m <= aModif->Upper(); m++)
              {
                if (aModif->Value(m).CaseNumber() == 2)
                  aXCAFModifiers.Append(
                  (XCAFDimTolObjects_DatumSingleModif)aModif->Value(m).
                    SimpleDatumReferenceModifierMember()->Value());
                else if (aModif->Value(m).CaseNumber() == 1)
                {
                  aXCAFModifWithVal = (XCAFDimTolObjects_DatumModifWithValue)(aModif->Value(m).DatumReferenceModifierWithValue()->ModifierType() + 1);
                  Standard_Real aVal = aModif->Value(m).DatumReferenceModifierWithValue()->ModifierValue()->ValueComponent();
                  StepBasic_Unit anUnit = aModif->Value(m).DatumReferenceModifierWithValue()->ModifierValue()->UnitComponent();
                  if (anUnit.IsNull()) continue;
                  if (!(anUnit.CaseNum(anUnit.Value()) == 1)) continue;
                  Handle(StepBasic_NamedUnit) NU = anUnit.NamedUnit();
                  STEPConstruct_UnitContext anUnitCtx;
                  anUnitCtx.ComputeFactors(NU);
                  aModifValue = aVal * anUnitCtx.LengthFactor();
                }
              }
            }
            aPositionCounter++;
            Interface_EntityIterator anIterDRC = aGraph.Shareds(aDRC);
            for (anIterDRC.Start(); anIterDRC.More(); anIterDRC.Next()) {

              if (anIterDRC.Value()->IsKind(STANDARD_TYPE(StepDimTol_Datum)))
              {
                Handle(StepDimTol_Datum) aD = Handle(StepDimTol_Datum)::DownCast(anIterDRC.Value());
                setDatumToXCAF(aD, theGDTL, aPositionCounter, aXCAFModifiers, aXCAFModifWithVal, aModifValue, theDoc, theWS);
              }
              else if (anIterDRC.Value()->IsKind(STANDARD_TYPE(StepDimTol_DatumReferenceElement)))
              {
                Handle(StepDimTol_DatumReferenceElement) aDRE
                  = Handle(StepDimTol_DatumReferenceElement)::DownCast(anIterDRC.Value());
                //get modifiers from group of datums
                Handle(StepDimTol_HArray1OfDatumReferenceModifier) aModifE = aDRE->Modifiers();
                if (!aModifE.IsNull())
                {
                  for (Standard_Integer k = aModifE->Lower(); k <= aModifE->Upper(); k++)
                  {
                    if (aModifE->Value(k).CaseNumber() == 2)
                      aXCAFModifiers.Append(
                      (XCAFDimTolObjects_DatumSingleModif)aModifE->Value(k).
                        SimpleDatumReferenceModifierMember()->Value());
                    else if (aModifE->Value(k).CaseNumber() == 1)
                    {
                      aXCAFModifWithVal = (XCAFDimTolObjects_DatumModifWithValue)(aModifE->Value(k).DatumReferenceModifierWithValue()->ModifierType() + 1);
                      Standard_Real aVal = aModifE->Value(k).DatumReferenceModifierWithValue()->ModifierValue()->ValueComponent();
                      StepBasic_Unit anUnit = aModifE->Value(k).DatumReferenceModifierWithValue()->ModifierValue()->UnitComponent();
                      if (anUnit.IsNull()) continue;
                      if (!(anUnit.CaseNum(anUnit.Value()) == 1)) continue;
                      Handle(StepBasic_NamedUnit) NU = anUnit.NamedUnit();
                      STEPConstruct_UnitContext anUnitCtx;
                      anUnitCtx.ComputeFactors(NU);
                      aModifValue = aVal * anUnitCtx.LengthFactor();
                    }
                  }
                }
                Interface_EntityIterator anIterDRE = aGraph.Shareds(aDRE);
                for (anIterDRE.Start(); anIterDRE.More(); anIterDRE.Next()) {
                  if (anIterDRE.Value()->IsKind(STANDARD_TYPE(StepDimTol_Datum)))
                  {
                    Handle(StepDimTol_Datum) aD = Handle(StepDimTol_Datum)::DownCast(anIterDRE.Value());
                    setDatumToXCAF(aD, theGDTL, aPositionCounter, aXCAFModifiers, aXCAFModifWithVal, aModifValue, theDoc, theWS);
                  }
                }
              }
            }
          }
        }
      }
    }
  }
  return Standard_True;
}

//=======================================================================
//function : createGeomTolObjectInXCAF
//purpose  : 
//=======================================================================
TDF_Label STEPCAFControl_Reader::createGDTObjectInXCAF(const Handle(Standard_Transient)& theEnt,
  const Handle(TDocStd_Document)& theDoc,
  const Handle(XSControl_WorkSession)& theWS)
{
  TDF_Label aGDTL;
  if (!theEnt->IsKind(STANDARD_TYPE(StepShape_DimensionalSize)) &&
    !theEnt->IsKind(STANDARD_TYPE(StepShape_DimensionalLocation)) &&
    !theEnt->IsKind(STANDARD_TYPE(StepDimTol_GeometricTolerance)))
  {
    return aGDTL;
  }

  Handle(TCollection_HAsciiString) aSemanticName;

  // protection against invalid input
  if (theEnt->IsKind(STANDARD_TYPE(StepDimTol_GeometricTolerance))) {
    Handle(StepDimTol_GeometricTolerance) aGeomTol = Handle(StepDimTol_GeometricTolerance)::DownCast(theEnt);
    if (aGeomTol->TolerancedShapeAspect().IsNull())
      return aGDTL;
    aSemanticName = aGeomTol->Name();
  }
  if (theEnt->IsKind(STANDARD_TYPE(StepShape_DimensionalSize))) {
    Handle(StepShape_DimensionalSize) aDim = Handle(StepShape_DimensionalSize)::DownCast(theEnt);
    if (aDim->AppliesTo().IsNull())
      return aGDTL;
    aSemanticName = aDim->Name();
  }
  if (theEnt->IsKind(STANDARD_TYPE(StepShape_DimensionalLocation))) {
    Handle(StepShape_DimensionalLocation) aDim = Handle(StepShape_DimensionalLocation)::DownCast(theEnt);
    if (aDim->RelatedShapeAspect().IsNull() || aDim->RelatingShapeAspect().IsNull())
      return aGDTL;
    aSemanticName = aDim->Name();
  }

  Handle(XCAFDoc_ShapeTool) aSTool = XCAFDoc_DocumentTool::ShapeTool(theDoc->Main());
  Handle(XCAFDoc_DimTolTool) aDGTTool = XCAFDoc_DocumentTool::DimTolTool(theDoc->Main());
  const Handle(XSControl_TransferReader) &aTR = theWS->TransferReader();
  const Handle(Transfer_TransientProcess) &aTP = aTR->TransientProcess();
  const Interface_Graph& aGraph = aTP->Graph();
  Standard_Boolean isAllAround = Standard_False;
  Standard_Boolean isAllOver = Standard_False;

  // find RepresentationItem for current Ent
  NCollection_Sequence<Handle(Standard_Transient)> aSeqRI1, aSeqRI2;

  // Collect all Shape_Aspect entities
  Interface_EntityIterator anIter = aGraph.Shareds(theEnt);
  for (anIter.Start(); anIter.More(); anIter.Next()) {
    Handle(Standard_Transient) anAtr = anIter.Value();
    NCollection_Sequence<Handle(StepRepr_ShapeAspect)> aSAs;
    if (anAtr->IsKind(STANDARD_TYPE(StepRepr_ProductDefinitionShape)))
    {
      //if associating tolerances with part (All-Over)
      Interface_EntityIterator anIterSDR = aGraph.Sharings(anAtr);
      for (anIterSDR.Start(); anIterSDR.More(); anIterSDR.Next())
      {
        Handle(Standard_Transient) anAtrSDR = anIterSDR.Value();
        if (anAtrSDR->IsKind(STANDARD_TYPE(StepShape_ShapeDefinitionRepresentation)))
        {
          isAllOver = Standard_True;
          Interface_EntityIterator anIterABSR = aGraph.Shareds(anAtrSDR);
          for (anIterABSR.Start(); anIterABSR.More(); anIterABSR.Next())
          {
            Handle(Standard_Transient) anAtrABSR = anIterABSR.Value();
            if (anAtrABSR->IsKind(STANDARD_TYPE(StepShape_AdvancedBrepShapeRepresentation)))
            {
              aSeqRI1.Append(anAtrABSR);
            }
          }
        }
      }
    }
    else if (anAtr->IsKind(STANDARD_TYPE(StepShape_DimensionalLocation)) ||
      anAtr->IsKind(STANDARD_TYPE(StepShape_DimensionalSize)))
    {
      //if tolerance attached to dimension
      Interface_EntityIterator anIterDim = aGraph.Shareds(anAtr);
      for (anIterDim.Start(); anIterDim.More(); anIterDim.Next())
      {
        Handle(StepRepr_ShapeAspect) aSA = Handle(StepRepr_ShapeAspect)::DownCast(anIterDim.Value());
        if (!aSA.IsNull()) {
          collectShapeAspect(aSA, theWS, aSAs);
        }
      }
    }
    else if (anAtr->IsKind(STANDARD_TYPE(StepRepr_ShapeAspect)))
    {
      if (anAtr->IsKind(STANDARD_TYPE(StepRepr_AllAroundShapeAspect)))
      {
        // if applyed AllAround Modifier
        isAllAround = Standard_True;
      }
      // dimensions and default tolerances
      Handle(StepRepr_ShapeAspect) aSA = Handle(StepRepr_ShapeAspect)::DownCast(anAtr);
      if (!aSA.IsNull()) {
        collectShapeAspect(aSA, theWS, aSAs);
      }
    }

    // Collect all representation items
    if (!aSAs.IsEmpty())
    {
      //get representation items
      NCollection_Sequence<Handle(Standard_Transient)> aSeqRI;
      for (Standard_Integer i = aSAs.Lower(); i <= aSAs.Upper(); i++)
      {
        Interface_EntityIterator anIterSA = aGraph.Sharings(aSAs.Value(i));
        Handle(StepAP242_GeometricItemSpecificUsage) aGISU;
        Handle(StepRepr_PropertyDefinition) PropD;
        for (anIterSA.Start(); anIterSA.More() && aGISU.IsNull() && PropD.IsNull(); anIterSA.Next()) {
          aGISU = Handle(StepAP242_GeometricItemSpecificUsage)::DownCast(anIterSA.Value());
          PropD = Handle(StepRepr_PropertyDefinition)::DownCast(anIterSA.Value());
        }
        if (!PropD.IsNull())//for old version
        {
          Handle(StepRepr_RepresentationItem) RI;
          Interface_EntityIterator subs4 = aGraph.Sharings(PropD);
          for (subs4.Start(); subs4.More(); subs4.Next()) {
            Handle(StepShape_ShapeDefinitionRepresentation) SDR =
              Handle(StepShape_ShapeDefinitionRepresentation)::DownCast(subs4.Value());
            if (!SDR.IsNull()) {
              Handle(StepRepr_Representation) Repr = SDR->UsedRepresentation();
              if (!Repr.IsNull() && Repr->NbItems() > 0) {
                RI = Repr->ItemsValue(1);
              }
            }
          }
          if (RI.IsNull()) continue;

          if (theEnt->IsKind(STANDARD_TYPE(StepShape_DimensionalSize))) {
            // read dimensions
            Handle(StepShape_EdgeCurve) EC = Handle(StepShape_EdgeCurve)::DownCast(RI);
            if (EC.IsNull()) continue;
            Handle(TCollection_HAsciiString) aName;
            Handle(StepShape_DimensionalSize) DimSize =
              Handle(StepShape_DimensionalSize)::DownCast(theEnt);
            Standard_Real dim1 = -1., dim2 = -1.;
            subs4 = aGraph.Sharings(DimSize);
            for (subs4.Start(); subs4.More(); subs4.Next()) {
              Handle(StepShape_DimensionalCharacteristicRepresentation) DimCharR =
                Handle(StepShape_DimensionalCharacteristicRepresentation)::DownCast(subs4.Value());
              if (!DimCharR.IsNull()) {
                Handle(StepShape_ShapeDimensionRepresentation) SDimR = DimCharR->Representation();
                if (!SDimR.IsNull() && SDimR->NbItems() > 0) {
                  Handle(StepRepr_RepresentationItem) anItem = SDimR->ItemsValue(1);
                  Handle(StepRepr_ValueRange) VR = Handle(StepRepr_ValueRange)::DownCast(anItem);
                  if (!VR.IsNull()) {
                    aName = VR->Name();
                    //StepRepr_CompoundItemDefinition CID = VR->ItemElement();
                    //if(CID.IsNull()) continue;
                    //Handle(StepRepr_CompoundItemDefinitionMember) CIDM = 
                    //  Handle(StepRepr_CompoundItemDefinitionMember)::DownCast(CID.Value());
                    //if(CIDM.IsNull()) continue;
                    //if(CIDM->ArrTransient().IsNull()) continue;
                    //Handle(StepRepr_HArray1OfRepresentationItem) HARI;
                    //if(CID.CaseMem(CIDM)==1)
                    //  HARI = CID.ListRepresentationItem();
                    //if(CID.CaseMem(CIDM)==2)
                    //  HARI = CID.SetRepresentationItem();
                    Handle(StepRepr_HArray1OfRepresentationItem) HARI = VR->ItemElement();
                    if (HARI.IsNull()) continue;
                    if (HARI->Length() > 0) {
                      Handle(StepRepr_RepresentationItem) RI1 = HARI->Value(1);
                      if (RI1.IsNull()) continue;
                      if (RI1->IsKind(STANDARD_TYPE(StepRepr_ReprItemAndLengthMeasureWithUnit))) {
                        Handle(StepRepr_ReprItemAndLengthMeasureWithUnit) RILMWU =
                          Handle(StepRepr_ReprItemAndLengthMeasureWithUnit)::DownCast(RI1);
                        dim1 = RILMWU->GetMeasureWithUnit()->ValueComponent();
                        StepBasic_Unit anUnit = RILMWU->GetMeasureWithUnit()->UnitComponent();
                        if (anUnit.IsNull()) continue;
                        if (!(anUnit.CaseNum(anUnit.Value()) == 1)) continue;
                        Handle(StepBasic_NamedUnit) NU = anUnit.NamedUnit();
                        STEPConstruct_UnitContext anUnitCtx;
                        anUnitCtx.ComputeFactors(NU);
                        dim1 = dim1 * anUnitCtx.LengthFactor();
                      }
                    }
                    if (HARI->Length() > 1) {
                      Handle(StepRepr_RepresentationItem) RI2 = HARI->Value(2);
                      if (RI2.IsNull()) continue;
                      if (RI2->IsKind(STANDARD_TYPE(StepRepr_ReprItemAndLengthMeasureWithUnit))) {
                        Handle(StepRepr_ReprItemAndLengthMeasureWithUnit) RILMWU =
                          Handle(StepRepr_ReprItemAndLengthMeasureWithUnit)::DownCast(RI2);
                        dim2 = RILMWU->GetMeasureWithUnit()->ValueComponent();
                        StepBasic_Unit anUnit = RILMWU->GetMeasureWithUnit()->UnitComponent();
                        if (anUnit.IsNull()) continue;
                        if (!(anUnit.CaseNum(anUnit.Value()) == 1)) continue;
                        Handle(StepBasic_NamedUnit) NU = anUnit.NamedUnit();
                        STEPConstruct_UnitContext anUnitCtx;
                        anUnitCtx.ComputeFactors(NU);
                        dim2 = dim2 * anUnitCtx.LengthFactor();
                      }
                    }
                  }
                }
              }
            }
            if (dim1 < 0) continue;
            if (dim2 < 0) dim2 = dim1;
            //cout<<"DimensionalSize: dim1="<<dim1<<"  dim2="<<dim2<<endl;
            // now we know edge_curve and value range therefore
            // we can create corresponding D&GT labels
            Standard_Integer index = aTP->MapIndex(EC);
            TopoDS_Shape aSh;
            if (index > 0) {
              Handle(Transfer_Binder) binder = aTP->MapItem(index);
              aSh = TransferBRep::ShapeResult(binder);
            }
            if (aSh.IsNull()) continue;
            TDF_Label shL;
            if (!aSTool->Search(aSh, shL, Standard_True, Standard_True, Standard_True)) continue;
            Handle(TColStd_HArray1OfReal) arr = new TColStd_HArray1OfReal(1, 2);
            arr->SetValue(1, dim1);
            arr->SetValue(2, dim2);
            aDGTTool->SetDimTol(shL, 1, arr, aName, DimSize->Name());
          }
          // read tolerances and datums
          else if (theEnt->IsKind(STANDARD_TYPE(StepDimTol_GeometricTolerance))) {
            Handle(StepDimTol_GeometricTolerance) GT =
              Handle(StepDimTol_GeometricTolerance)::DownCast(theEnt);
            // read common data for tolerance
            //Standard_Real dim = GT->Magnitude()->ValueComponent();
            Handle(StepBasic_MeasureWithUnit) dim3 = GT->Magnitude();
            if (dim3.IsNull()) continue;
            Standard_Real dim = dim3->ValueComponent();
            StepBasic_Unit anUnit = GT->Magnitude()->UnitComponent();
            if (anUnit.IsNull()) continue;
            if (!(anUnit.CaseNum(anUnit.Value()) == 1)) continue;
            Handle(StepBasic_NamedUnit) NU = anUnit.NamedUnit();
            STEPConstruct_UnitContext anUnitCtx;
            anUnitCtx.ComputeFactors(NU);
            dim = dim * anUnitCtx.LengthFactor();
            //cout<<"GeometricTolerance: Magnitude = "<<dim<<endl;
            Handle(TColStd_HArray1OfReal) arr = new TColStd_HArray1OfReal(1, 1);
            arr->SetValue(1, dim);
            Handle(TCollection_HAsciiString) aName = GT->Name();
            Handle(TCollection_HAsciiString) aDescription = GT->Description();
            Handle(StepShape_AdvancedFace) AF = Handle(StepShape_AdvancedFace)::DownCast(RI);
            if (AF.IsNull()) continue;
            Standard_Integer index = aTP->MapIndex(AF);
            TopoDS_Shape aSh;
            if (index > 0) {
              Handle(Transfer_Binder) binder = aTP->MapItem(index);
              aSh = TransferBRep::ShapeResult(binder);
            }
            if (aSh.IsNull()) continue;
            TDF_Label shL;
            if (!aSTool->Search(aSh, shL, Standard_True, Standard_True, Standard_True)) continue;
            // read specific data for tolerance
            if (GT->IsKind(STANDARD_TYPE(StepDimTol_GeoTolAndGeoTolWthDatRefAndModGeoTolAndPosTol))) {
              Handle(StepDimTol_GeoTolAndGeoTolWthDatRefAndModGeoTolAndPosTol) GTComplex =
                Handle(StepDimTol_GeoTolAndGeoTolWthDatRefAndModGeoTolAndPosTol)::DownCast(theEnt);
              Standard_Integer kind = 20;
              Handle(StepDimTol_ModifiedGeometricTolerance) MGT =
                GTComplex->GetModifiedGeometricTolerance();
              if (!MGT.IsNull()) {
                kind = kind + MGT->Modifier() + 1;
              }
              TDF_Label TolerL = aDGTTool->SetDimTol(shL, kind, arr, aName, aDescription);
              // translate datums connected with this tolerance
              Handle(StepDimTol_GeometricToleranceWithDatumReference) GTWDR =
                GTComplex->GetGeometricToleranceWithDatumReference();
              if (!GTWDR.IsNull()) {
                ReadDatums(aSTool, aDGTTool, aGraph, aTP, TolerL, GTWDR);
              }
            }
            else if (GT->IsKind(STANDARD_TYPE(StepDimTol_GeometricToleranceWithDatumReference))) {
              Handle(StepDimTol_GeometricToleranceWithDatumReference) GTWDR =
                Handle(StepDimTol_GeometricToleranceWithDatumReference)::DownCast(theEnt);
              if (GTWDR.IsNull()) continue;
              Standard_Integer kind = 0;
              if (GTWDR->IsKind(STANDARD_TYPE(StepDimTol_AngularityTolerance)))       kind = 24;
              else if (GTWDR->IsKind(STANDARD_TYPE(StepDimTol_CircularRunoutTolerance)))   kind = 25;
              else if (GTWDR->IsKind(STANDARD_TYPE(StepDimTol_CoaxialityTolerance)))       kind = 26;
              else if (GTWDR->IsKind(STANDARD_TYPE(StepDimTol_ConcentricityTolerance)))    kind = 27;
              else if (GTWDR->IsKind(STANDARD_TYPE(StepDimTol_ParallelismTolerance)))      kind = 28;
              else if (GTWDR->IsKind(STANDARD_TYPE(StepDimTol_PerpendicularityTolerance))) kind = 29;
              else if (GTWDR->IsKind(STANDARD_TYPE(StepDimTol_SymmetryTolerance)))         kind = 30;
              else if (GTWDR->IsKind(STANDARD_TYPE(StepDimTol_TotalRunoutTolerance)))      kind = 31;
              //cout<<"GTWDR: kind="<<kind<<endl;
              TDF_Label TolerL = aDGTTool->SetDimTol(shL, kind, arr, aName, aDescription);
              ReadDatums(aSTool, aDGTTool, aGraph, aTP, TolerL, GTWDR);
            }
            else if (GT->IsKind(STANDARD_TYPE(StepDimTol_ModifiedGeometricTolerance))) {
              Handle(StepDimTol_ModifiedGeometricTolerance) MGT =
                Handle(StepDimTol_ModifiedGeometricTolerance)::DownCast(theEnt);
              Standard_Integer kind = 35 + MGT->Modifier();
              aDGTTool->SetDimTol(shL, kind, arr, aName, aDescription);
            }
            else if (GT->IsKind(STANDARD_TYPE(StepDimTol_CylindricityTolerance))) {
              aDGTTool->SetDimTol(shL, 38, arr, aName, aDescription);
            }
            else if (GT->IsKind(STANDARD_TYPE(StepDimTol_FlatnessTolerance))) {
              aDGTTool->SetDimTol(shL, 39, arr, aName, aDescription);
            }
            else if (GT->IsKind(STANDARD_TYPE(StepDimTol_LineProfileTolerance))) {
              aDGTTool->SetDimTol(shL, 40, arr, aName, aDescription);
            }
            else if (GT->IsKind(STANDARD_TYPE(StepDimTol_PositionTolerance))) {
              aDGTTool->SetDimTol(shL, 41, arr, aName, aDescription);
            }
            else if (GT->IsKind(STANDARD_TYPE(StepDimTol_RoundnessTolerance))) {
              aDGTTool->SetDimTol(shL, 42, arr, aName, aDescription);
            }
            else if (GT->IsKind(STANDARD_TYPE(StepDimTol_StraightnessTolerance))) {
              aDGTTool->SetDimTol(shL, 43, arr, aName, aDescription);
            }
            else if (GT->IsKind(STANDARD_TYPE(StepDimTol_SurfaceProfileTolerance))) {
              aDGTTool->SetDimTol(shL, 44, arr, aName, aDescription);
            }
          }
        }
        else
        {
          if (aGISU.IsNull()) continue;
          Standard_Integer j = 1;
          for (; j <= aGISU->NbIdentifiedItem(); j++) {
            aSeqRI.Append(aGISU->IdentifiedItemValue(j));
          }
        }
      }
      if (!aSeqRI.IsEmpty())
      {
        if (aSeqRI1.IsEmpty())
          aSeqRI1 = aSeqRI;
        else
          aSeqRI2 = aSeqRI;
      }
    }
  }
  if (aSeqRI1.IsEmpty())
    return aGDTL;

  TDF_LabelSequence aShLS1, aShLS2;

  // Collect shapes
  for (Standard_Integer i = aSeqRI1.Lower(); i <= aSeqRI1.Upper();i++)
  {
    Standard_Integer anIndex = FindShapeIndexForDGT(aSeqRI1.Value(i), theWS);
    TopoDS_Shape aSh;
    if (anIndex > 0) {
      Handle(Transfer_Binder) aBinder = aTP->MapItem(anIndex);
      aSh = TransferBRep::ShapeResult(aBinder);
    }
    if (!aSh.IsNull())
    {
      TDF_Label aShL;
      aSTool->Search(aSh, aShL, Standard_True, Standard_True, Standard_True);
      if (aShL.IsNull() && aSh.ShapeType() == TopAbs_WIRE)
      {
        TopExp_Explorer ex(aSh, TopAbs_EDGE, TopAbs_SHAPE);
        while (ex.More())
        {
          TDF_Label edgeL;
          aSTool->Search(ex.Current(), edgeL, Standard_True, Standard_True, Standard_True);
          if (!edgeL.IsNull())
            aShLS1.Append(edgeL);
          ex.Next();
        }
      }
      if (!aShL.IsNull())
        aShLS1.Append(aShL);
    }
  }
  if (!aSeqRI2.IsEmpty())
  {
    //for dimensional location
    for (Standard_Integer i = aSeqRI2.Lower(); i <= aSeqRI2.Upper();i++)
    {
      Standard_Integer anIndex = FindShapeIndexForDGT(aSeqRI2.Value(i), theWS);
      TopoDS_Shape aSh;
      if (anIndex > 0) {
        Handle(Transfer_Binder) aBinder = aTP->MapItem(anIndex);
        aSh = TransferBRep::ShapeResult(aBinder);
      }
      if (!aSh.IsNull())
      {
        TDF_Label aShL;
        aSTool->Search(aSh, aShL, Standard_True, Standard_True, Standard_True);
        if (aShL.IsNull() && aSh.ShapeType() == TopAbs_WIRE)
        {
          TopExp_Explorer ex(aSh, TopAbs_EDGE, TopAbs_SHAPE);
          while (ex.More())
          {
            TDF_Label edgeL;
            aSTool->Search(ex.Current(), edgeL, Standard_True, Standard_True, Standard_True);
            if (!edgeL.IsNull())
              aShLS2.Append(edgeL);
            ex.Next();
          }
        }
        if (!aShL.IsNull())
          aShLS2.Append(aShL);
      }
    }
  }

  if (!aShLS1.IsEmpty())
  {
    // add to XCAF
    if (!theEnt->IsKind(STANDARD_TYPE(StepDimTol_GeometricTolerance)))
    {
      aGDTL = aDGTTool->AddDimension();
      myGDTMap.Bind(theEnt, aGDTL);
      aDGTTool->Lock(aGDTL);
      Handle(XCAFDoc_Dimension) aDim = XCAFDoc_Dimension::Set(aGDTL);
      TCollection_AsciiString aStr("DGT:Dimensional_");
      if (theEnt->IsKind(STANDARD_TYPE(StepShape_DimensionalSize)))
      {
        aStr.AssignCat("Size");
      }
      else if (theEnt->IsKind(STANDARD_TYPE(StepShape_DimensionalLocation)))
      {
        aStr.AssignCat("Location");
      }
      TDataStd_Name::Set(aGDTL, aStr);

      if (!aShLS2.IsEmpty())
      {
        aDGTTool->SetDimension(aShLS1, aShLS2, aGDTL);
      }
      else
      {
        TDF_LabelSequence aEmptySeq;
        aDGTTool->SetDimension(aShLS1, aEmptySeq, aGDTL);
      }
    }
    else
    {
      aGDTL = aDGTTool->AddGeomTolerance();
      myGDTMap.Bind(theEnt, aGDTL);
      aDGTTool->Lock(aGDTL);
      Handle(XCAFDoc_GeomTolerance) aGTol = XCAFDoc_GeomTolerance::Set(aGDTL);
      TCollection_AsciiString aStr("DGT:GeomTolerance");
      TDataStd_Name::Set(aGDTL, aStr);
      aDGTTool->SetGeomTolerance(aShLS1, aGDTL);
      Handle(XCAFDimTolObjects_GeomToleranceObject) anObj = aGTol->GetObject();
      if (isAllAround)
        anObj->AddModifier(XCAFDimTolObjects_GeomToleranceModif_All_Around);
      else if (isAllOver)
        anObj->AddModifier(XCAFDimTolObjects_GeomToleranceModif_All_Over);
      aGTol->SetObject(anObj);
    }

    if (aSemanticName)
    {
      TCollection_ExtendedString str(aSemanticName->String());
      TDataStd_Name::Set(aGDTL, str);
    }

    readDatumsAP242(theEnt, aGDTL, theDoc, theWS);
  }
  return aGDTL;
}

//=======================================================================
//function : convertAngleValue
//purpose  : auxilary
//=======================================================================
void convertAngleValue(
  const STEPConstruct_UnitContext& anUnitCtx,
  Standard_Real& aVal)
{
  // convert radian to deg
  Standard_Real aFact = anUnitCtx.PlaneAngleFactor() * 180 / M_PI;
  // in order to avoid inaccuracy of calculation perform conversion
  // only if aFact not eqaul 1 with some precision
  if (fabs(1. - aFact) > Precision::Confusion())
  {
    aVal = aVal * aFact;
  }
}


//=======================================================================
//function : setDimObjectToXCAF
//purpose  : 
//=======================================================================
static void setDimObjectToXCAF(const Handle(Standard_Transient)& theEnt,
  const TDF_Label& aDimL,
  const Handle(TDocStd_Document)& theDoc,
  const Handle(XSControl_WorkSession)& theWS)
{
  Handle(XCAFDoc_ShapeTool) aSTool = XCAFDoc_DocumentTool::ShapeTool(theDoc->Main());
  Handle(XCAFDoc_DimTolTool) aDGTTool = XCAFDoc_DocumentTool::DimTolTool(theDoc->Main());
  const Handle(XSControl_TransferReader) &aTR = theWS->TransferReader();
  const Handle(Transfer_TransientProcess) &aTP = aTR->TransientProcess();
  const Interface_Graph& aGraph = aTP->Graph();
  Handle(XCAFDimTolObjects_DimensionObject) aDimObj;
  if (!theEnt->IsKind(STANDARD_TYPE(StepShape_DimensionalSize)) &&
    !theEnt->IsKind(STANDARD_TYPE(StepShape_DimensionalLocation)))
    return;

  Handle(StepShape_DimensionalSize) aDimSize =
    Handle(StepShape_DimensionalSize)::DownCast(theEnt);
  Handle(StepShape_DimensionalLocation) aDimLocation =
    Handle(StepShape_DimensionalLocation)::DownCast(theEnt);

  aDimObj = new XCAFDimTolObjects_DimensionObject();
  Standard_Real aDim1 = -1., aDim2 = -1., aDim3 = -1.;
  Standard_Boolean isPlusMinusTolerance = Standard_False;
  Handle(StepShape_TypeQualifier) aTQ;
  Handle(StepShape_ValueFormatTypeQualifier) aVFTQ;
  Handle(StepShape_ToleranceValue) aTV;
  Handle(StepShape_LimitsAndFits) aLAF;
  Handle(StepRepr_CompoundRepresentationItem) aCRI;
  Handle(StepGeom_Axis2Placement3d) anAP;

  Interface_EntityIterator anIterDim;
  if (!aDimSize.IsNull())
  {
    anIterDim = aGraph.Sharings(aDimSize);
  }
  else
  {
    anIterDim = aGraph.Sharings(aDimLocation);
  }
  for (anIterDim.Start(); anIterDim.More(); anIterDim.Next()) {
    Handle(StepShape_DimensionalCharacteristicRepresentation) aDCR =
      Handle(StepShape_DimensionalCharacteristicRepresentation)::DownCast(anIterDim.Value());
    Handle(StepShape_PlusMinusTolerance) aPMT =
      Handle(StepShape_PlusMinusTolerance)::DownCast(anIterDim.Value());
    if (!aDCR.IsNull()) {
      Handle(StepShape_ShapeDimensionRepresentation) aSDR = aDCR->Representation();
      if (!aSDR.IsNull()) {
        Handle(StepRepr_HArray1OfRepresentationItem) aHARI = aSDR->Items();

        if (!aHARI.IsNull())
        {
          for (Standard_Integer nr = aHARI->Lower(); nr <= aHARI->Upper(); nr++)
          {
            Handle(StepRepr_RepresentationItem) aDRI = aHARI->Value(nr);
            if (aDRI.IsNull()) continue;

            if (aDRI->IsKind(STANDARD_TYPE(StepRepr_ReprItemAndMeasureWithUnit))) {
              // simple value / range
              Handle(StepRepr_ReprItemAndMeasureWithUnit) aMWU =
                Handle(StepRepr_ReprItemAndMeasureWithUnit)::DownCast(aDRI);
              Standard_Real aVal = aMWU->GetMeasureWithUnit()->ValueComponent();
              StepBasic_Unit anUnit = aMWU->GetMeasureWithUnit()->UnitComponent();
              if (anUnit.IsNull())
                continue;
              if (!(anUnit.CaseNum(anUnit.Value()) == 1))
                continue;
              Handle(StepBasic_NamedUnit) NU = anUnit.NamedUnit();
              STEPConstruct_UnitContext anUnitCtx;
              anUnitCtx.ComputeFactors(NU);
              if (aMWU->IsKind(STANDARD_TYPE(StepRepr_ReprItemAndLengthMeasureWithUnit))) {
                aVal = aVal * anUnitCtx.LengthFactor();

              }
              else
                if (aMWU->IsKind(STANDARD_TYPE(StepRepr_ReprItemAndPlaneAngleMeasureWithUnit))) {
                  convertAngleValue(anUnitCtx, aVal);
                }
              Handle(TCollection_HAsciiString) aName = aMWU->Name();
              if (aName->Search("upper") > 0) // upper limit
                aDim2 = aVal;
              else // lower limit or simple nominal value
                aDim1 = aVal;
            }
            else if (aDRI->IsKind(STANDARD_TYPE(StepRepr_ReprItemAndMeasureWithUnitAndQRI))) {
              // value with qualifier (minimum/maximum/average)
              Handle(StepRepr_ReprItemAndMeasureWithUnitAndQRI) aMWU =
                Handle(StepRepr_ReprItemAndMeasureWithUnitAndQRI)::DownCast(aDRI);
              Standard_Real aVal = aMWU->GetMeasureWithUnit()->ValueComponent();
              StepBasic_Unit anUnit = aMWU->GetMeasureWithUnit()->UnitComponent();
              if (anUnit.IsNull())
                continue;
              if (!(anUnit.CaseNum(anUnit.Value()) == 1))
                continue;
              Handle(StepBasic_NamedUnit) NU = anUnit.NamedUnit();
              STEPConstruct_UnitContext anUnitCtx;
              anUnitCtx.ComputeFactors(NU);
              if (aMWU->IsKind(STANDARD_TYPE(StepRepr_ReprItemAndLengthMeasureWithUnitAndQRI))) {
                aVal = aVal * anUnitCtx.LengthFactor();
              }
              else
                if (aMWU->IsKind(STANDARD_TYPE(StepRepr_ReprItemAndPlaneAngleMeasureWithUnitAndQRI))) {
                  convertAngleValue(anUnitCtx, aVal);
                }
              Handle(StepShape_QualifiedRepresentationItem) aQRI = aMWU->GetQualifiedRepresentationItem();
              if (aQRI->Qualifiers()->Length() == 0) {
                aDim1 = aVal;
                continue;
              }
              Handle(StepShape_TypeQualifier) aValueType = aQRI->Qualifiers()->Value(1).TypeQualifier();
              if (aValueType->Name()->String().IsEqual("minimum"))
                aDim2 = aVal;
              else if (aValueType->Name()->String().IsEqual("maximum"))
                aDim3 = aVal;
              else aDim1 = aVal;
            }
            else if (aDRI->IsKind(STANDARD_TYPE(StepShape_QualifiedRepresentationItem))) {
              //get qualifier
              Handle(StepShape_QualifiedRepresentationItem) aQRI =
                Handle(StepShape_QualifiedRepresentationItem)::DownCast(aDRI);
              for (Standard_Integer l = 1; l <= aQRI->NbQualifiers(); l++)
              {
                aTQ = aQRI->Qualifiers()->Value(l).TypeQualifier();
                aVFTQ = aQRI->Qualifiers()->Value(l).ValueFormatTypeQualifier();
              }
            }
            else if (aDRI->IsKind(STANDARD_TYPE(StepRepr_DescriptiveRepresentationItem))) {
              Handle(StepRepr_DescriptiveRepresentationItem) aDescription =
                Handle(StepRepr_DescriptiveRepresentationItem)::DownCast(aDRI);
              aDimObj->AddDescription(aDescription->Description(), aDescription->Name());
            }
            else if (aDRI->IsKind(STANDARD_TYPE(StepRepr_CompoundRepresentationItem))) {
              aCRI = Handle(StepRepr_CompoundRepresentationItem)::DownCast(aDRI);
            }
            else if (aDRI->IsKind(STANDARD_TYPE(StepGeom_Axis2Placement3d)))
            {
              anAP = Handle(StepGeom_Axis2Placement3d)::DownCast(aDRI);
            }
          }
        }
      }
    }
    else if (!aPMT.IsNull())
    {
      isPlusMinusTolerance = Standard_True;
      StepShape_ToleranceMethodDefinition aTMD = aPMT->Range();
      if (aPMT.IsNull()) continue;
      if (aTMD.CaseNumber() == 1)
        //! 1 -> ToleranceValue from StepShape
        //! 2 -> LimitsAndFits from StepShape
      {
        //plus minus tolerance 
        aTV = aTMD.ToleranceValue();
        if (aTV.IsNull()) continue;

        Handle(Standard_Transient) aUpperBound = aTV->UpperBound();
        if(aUpperBound.IsNull())
          continue;
        Handle(StepBasic_MeasureWithUnit) aMWU;
        if(aUpperBound->IsKind(STANDARD_TYPE(StepBasic_MeasureWithUnit)) )
          aMWU = Handle(StepBasic_MeasureWithUnit)::DownCast(aUpperBound);
        else if(aUpperBound->IsKind(STANDARD_TYPE(StepRepr_ReprItemAndMeasureWithUnit)) )
        {
          Handle(StepRepr_ReprItemAndMeasureWithUnit) aReprMeasureItem = 
            Handle(StepRepr_ReprItemAndMeasureWithUnit)::DownCast(aUpperBound);
          aMWU = aReprMeasureItem->GetMeasureWithUnit();

        }
        if(aMWU.IsNull())
          continue;
        Standard_Real aVal = aMWU->ValueComponent();
        StepBasic_Unit anUnit = aMWU->UnitComponent();
        if (anUnit.IsNull()) continue;
        if (!(anUnit.CaseNum(anUnit.Value()) == 1)) continue;
        Handle(StepBasic_NamedUnit) NU = anUnit.NamedUnit();
        STEPConstruct_UnitContext anUnitCtx;
        anUnitCtx.ComputeFactors(NU);
        if (aMWU->IsKind(STANDARD_TYPE(StepBasic_LengthMeasureWithUnit)) ||
          aMWU->IsKind(STANDARD_TYPE(StepRepr_ReprItemAndLengthMeasureWithUnitAndQRI)))
        {
          aVal = aVal * anUnitCtx.LengthFactor();
        }
        else if (aMWU->IsKind(STANDARD_TYPE(StepBasic_PlaneAngleMeasureWithUnit)) ||
          aMWU->IsKind(STANDARD_TYPE(StepRepr_ReprItemAndPlaneAngleMeasureWithUnitAndQRI)))
        {
          convertAngleValue(anUnitCtx, aVal);
        }
        aDim3 = aVal;

        
        Handle(Standard_Transient) aLowerBound = aTV->LowerBound();
        if(aLowerBound.IsNull())
          continue;
       
        if(aLowerBound->IsKind(STANDARD_TYPE(StepBasic_MeasureWithUnit)) )
          aMWU = Handle(StepBasic_MeasureWithUnit)::DownCast(aLowerBound);
        else if(aLowerBound->IsKind(STANDARD_TYPE(StepRepr_ReprItemAndMeasureWithUnit)) )
        {
          Handle(StepRepr_ReprItemAndMeasureWithUnit) aReprMeasureItem = 
            Handle(StepRepr_ReprItemAndMeasureWithUnit)::DownCast(aLowerBound);
          aMWU = aReprMeasureItem->GetMeasureWithUnit();

        }
        if(aMWU.IsNull())
          continue;
      
        aVal = aMWU->ValueComponent();
        anUnit = aMWU->UnitComponent();
        if (anUnit.IsNull()) continue;
        if (!(anUnit.CaseNum(anUnit.Value()) == 1)) continue;
        NU = anUnit.NamedUnit();
        anUnitCtx.ComputeFactors(NU);
        if (aMWU->IsKind(STANDARD_TYPE(StepBasic_LengthMeasureWithUnit)) ||
          aMWU->IsKind(STANDARD_TYPE(StepRepr_ReprItemAndLengthMeasureWithUnitAndQRI)))
        {
          aVal = aVal * anUnitCtx.LengthFactor();
        }
        else if (aMWU->IsKind(STANDARD_TYPE(StepBasic_PlaneAngleMeasureWithUnit)) ||
          aMWU->IsKind(STANDARD_TYPE(StepRepr_ReprItemAndPlaneAngleMeasureWithUnitAndQRI)))
        {
          convertAngleValue(anUnitCtx, aVal);
        }
        aDim2 = Abs(aVal);
      }
      else
      {
        // class of tolerance
        aLAF = aTMD.LimitsAndFits();
      }
    }
  }

  if (aDim1 < 0) return;

  if (aDim2 < 0)
    aDimObj->SetValue(aDim1);
  else if (aDim3 < 0)
  {
    Handle(TColStd_HArray1OfReal) anArr = new TColStd_HArray1OfReal(1, 2);
    anArr->SetValue(1, aDim1);
    anArr->SetValue(2, aDim2);
    aDimObj->SetValues(anArr);
  }
  else
  {
    Handle(TColStd_HArray1OfReal) anArr = new TColStd_HArray1OfReal(1, 3);
    if (!isPlusMinusTolerance)
    {
      aDim2 = aDim1 - aDim2;
      aDim3 = aDim3 - aDim1;
    }
    anArr->SetValue(1, aDim1);
    anArr->SetValue(2, aDim2);
    anArr->SetValue(3, aDim3);
    aDimObj->SetValues(anArr);
  }
  if (!aTQ.IsNull())
  {
    XCAFDimTolObjects_DimensionQualifier aQ;
    if (STEPCAFControl_GDTProperty::GetDimQualifierType(aTQ->Name(), aQ))
    {
      aDimObj->SetQualifier(aQ);
    }
  }

  if (!aVFTQ.IsNull())
  {
    //A typical value would be 'NR2 2.2'
    TCollection_HAsciiString aFormat = aVFTQ->FormatType();
    Standard_Integer i = aFormat.Location(1, ' ', 1, aFormat.Length());
    aFormat.SubString(i + 1, i + 1)->IntegerValue();
    aDimObj->SetNbOfDecimalPlaces(aFormat.SubString(i + 1, i + 1)->IntegerValue(),
      aFormat.SubString(i + 3, i + 3)->IntegerValue());
  }

  if (!aLAF.IsNull())
  {
    //get class of tolerance
    Standard_Boolean aHolle = Standard_False;
    XCAFDimTolObjects_DimensionFormVariance aFV = XCAFDimTolObjects_DimensionFormVariance_None;
    XCAFDimTolObjects_DimensionGrade aG = XCAFDimTolObjects_DimensionGrade_IT01;
    STEPCAFControl_GDTProperty::GetDimClassOfTolerance(aLAF, aHolle, aFV, aG);
    aDimObj->SetClassOfTolerance(aHolle, aFV, aG);
  }

  if (!aCRI.IsNull() && !aCRI->ItemElement().IsNull() && aCRI->ItemElement()->Length() > 0)
  {
    //get modifiers
    XCAFDimTolObjects_DimensionModifiersSequence aModifiers;
    STEPCAFControl_GDTProperty::GetDimModifiers(aCRI, aModifiers);
    if (aModifiers.Length() > 0)
      aDimObj->SetModifiers(aModifiers);
  }

  Handle(TCollection_HAsciiString) aName;
  if (!aDimSize.IsNull())
  {
    aName = aDimSize->Name();
  }
  else
  {
    aName = aDimLocation->Name();
  }
  XCAFDimTolObjects_DimensionType aType = XCAFDimTolObjects_DimensionType_Location_None;
  if (!STEPCAFControl_GDTProperty::GetDimType(aName, aType))
  {
    if (!aDimSize.IsNull())
    {
      Handle(StepShape_AngularSize) anAngSize =
        Handle(StepShape_AngularSize)::DownCast(aDimSize);
      if (!anAngSize.IsNull())
      {
        //get qualifier for angular value
        aType = XCAFDimTolObjects_DimensionType_Size_Angular;
        if (anAngSize->AngleSelection() == StepShape_Equal)
          aDimObj->SetQualifier(XCAFDimTolObjects_DimensionQualifier_Avg);
        else if (anAngSize->AngleSelection() == StepShape_Large)
          aDimObj->SetQualifier(XCAFDimTolObjects_DimensionQualifier_Max);
        else if (anAngSize->AngleSelection() == StepShape_Small)
          aDimObj->SetQualifier(XCAFDimTolObjects_DimensionQualifier_Min);
      }
    }
    else
    {
      Handle(StepShape_AngularLocation) anAngLoc =
        Handle(StepShape_AngularLocation)::DownCast(aDimLocation);
      if (!anAngLoc.IsNull())
      {
        //get qualifier for angular value
        aType = XCAFDimTolObjects_DimensionType_Location_Angular;
        if (anAngLoc->AngleSelection() == StepShape_Equal)
          aDimObj->SetQualifier(XCAFDimTolObjects_DimensionQualifier_Avg);
        else if (anAngLoc->AngleSelection() == StepShape_Large)
          aDimObj->SetQualifier(XCAFDimTolObjects_DimensionQualifier_Max);
        else if (anAngLoc->AngleSelection() == StepShape_Small)
          aDimObj->SetQualifier(XCAFDimTolObjects_DimensionQualifier_Min);
      }
    }
    if (aType == XCAFDimTolObjects_DimensionType_Location_None)
    {
      Handle(StepRepr_ShapeAspect) aPSA;
      if (!aDimSize.IsNull())
      {
        Handle(StepShape_DimensionalSizeWithPath) aDimSizeWithPath =
          Handle(StepShape_DimensionalSizeWithPath)::DownCast(aDimSize);
        if (!aDimSizeWithPath.IsNull())
        {
          aType = XCAFDimTolObjects_DimensionType_Size_WithPath;
          aPSA = aDimSizeWithPath->Path();
        }
      }
      else
      {
        Handle(StepShape_DimensionalLocationWithPath) aDimLocWithPath =
          Handle(StepShape_DimensionalLocationWithPath)::DownCast(aDimLocation);
        if (!aDimLocWithPath.IsNull())
        {
          aType = XCAFDimTolObjects_DimensionType_Location_WithPath;
          aPSA = aDimLocWithPath->Path();
        }
      }

      if (!aPSA.IsNull())
      {
        //for DimensionalLocationWithPath
        Handle(StepGeom_GeometricRepresentationItem) aGRI;
        Handle(StepAP242_GeometricItemSpecificUsage) aPGISU;
        Interface_EntityIterator anIterDSWP = aGraph.Sharings(aPSA);
        for (anIterDSWP.Start(); anIterDSWP.More() && aPGISU.IsNull(); anIterDSWP.Next()) {
          aPGISU = Handle(StepAP242_GeometricItemSpecificUsage)::DownCast(anIterDSWP.Value());
        }
        if (aPGISU.IsNull()) return;
        if (aPGISU->NbIdentifiedItem() > 0) {
          aGRI = Handle(StepGeom_GeometricRepresentationItem)::DownCast(aPGISU->IdentifiedItemValue(1));
        }
        if (aGRI.IsNull()) return;
        Handle(StepRepr_RepresentationItem) aPRI;
        Interface_EntityIterator anIterGRI = aGraph.Sharings(aGRI);
        for (anIterGRI.Start(); anIterGRI.More() && aPGISU.IsNull(); anIterGRI.Next()) {
          aPRI = Handle(StepRepr_RepresentationItem)::DownCast(anIterGRI.Value());
        }
        Standard_Integer anIndex = FindShapeIndexForDGT(aPRI, theWS);
        TopoDS_Edge aSh;
        if (anIndex > 0) {
          Handle(Transfer_Binder) aBinder = aTP->MapItem(anIndex);
          aSh = TopoDS::Edge(TransferBRep::ShapeResult(aBinder));
        }
        if (aSh.IsNull()) return;
        aDimObj->SetPath(aSh);
      }
      else if (!anAP.IsNull())
      {
        if (anAP->Name()->String().IsEqual("orientation") && !anAP->Axis().IsNull())
        {
          //for Oriented Dimensional Location
          Handle(TColStd_HArray1OfReal) aDirArr = anAP->RefDirection()->DirectionRatios();
          gp_Dir aDir;
          if (!aDirArr.IsNull() && aDirArr->Length() > 2)
          {
            aDir.SetCoord(aDirArr->Lower(), aDirArr->Lower() + 1, aDirArr->Lower() + 2);
            aDimObj->SetDirection(aDir);
          }
          else if (aDirArr->Length() > 1)
          {
            aDir.SetCoord(aDirArr->Lower(), aDirArr->Lower() + 1, 0);
            aDimObj->SetDirection(aDir);
          }
        }
      }
    }
  }
  aDimObj->SetType(aType);


  if (!aDimObj.IsNull())
  {

    Handle(XCAFDoc_Dimension) aDim;

    if (aDimL.FindAttribute(XCAFDoc_Dimension::GetID(), aDim))
    {
      readAnnotation(aTR, theEnt, aDimObj);
      readConnectionPoints(aTR, theEnt, aDimObj);
      aDim->SetObject(aDimObj);
    }
  }
}

//=======================================================================
//function : getTolType
//purpose  : 
//=======================================================================
static Standard_Boolean getTolType(const Handle(Standard_Transient)& theEnt,
  XCAFDimTolObjects_GeomToleranceType& theType)
{
  if (theEnt.IsNull() || !theEnt->IsKind(STANDARD_TYPE(StepDimTol_GeometricTolerance)))
    return Standard_False;
  theType = XCAFDimTolObjects_GeomToleranceType_None;
  if (theEnt->IsKind(STANDARD_TYPE(StepDimTol_GeoTolAndGeoTolWthDatRef)))
  {
    Handle(StepDimTol_GeoTolAndGeoTolWthDatRef) anE = Handle(StepDimTol_GeoTolAndGeoTolWthDatRef)::DownCast(theEnt);
    theType = STEPCAFControl_GDTProperty::GetGeomToleranceType(anE->GetToleranceType());
  }
  else if (theEnt->IsKind(STANDARD_TYPE(StepDimTol_GeoTolAndGeoTolWthDatRefAndGeoTolWthMaxTol)))
  {
    Handle(StepDimTol_GeoTolAndGeoTolWthDatRefAndGeoTolWthMaxTol) anE =
      Handle(StepDimTol_GeoTolAndGeoTolWthDatRefAndGeoTolWthMaxTol)::DownCast(theEnt);
    theType = STEPCAFControl_GDTProperty::GetGeomToleranceType(anE->GetToleranceType());
  }
  else if (theEnt->IsKind(STANDARD_TYPE(StepDimTol_GeoTolAndGeoTolWthDatRefAndGeoTolWthMod)))
  {
    Handle(StepDimTol_GeoTolAndGeoTolWthDatRefAndGeoTolWthMod) anE =
      Handle(StepDimTol_GeoTolAndGeoTolWthDatRefAndGeoTolWthMod)::DownCast(theEnt);
    theType = STEPCAFControl_GDTProperty::GetGeomToleranceType(anE->GetToleranceType());
  }
  else if (theEnt->IsKind(STANDARD_TYPE(StepDimTol_GeoTolAndGeoTolWthMaxTol)))
  {
    Handle(StepDimTol_GeoTolAndGeoTolWthMaxTol) anE =
      Handle(StepDimTol_GeoTolAndGeoTolWthMaxTol)::DownCast(theEnt);
    theType = STEPCAFControl_GDTProperty::GetGeomToleranceType(anE->GetToleranceType());
  }
  else if (theEnt->IsKind(STANDARD_TYPE(StepDimTol_GeoTolAndGeoTolWthMod)))
  {
    Handle(StepDimTol_GeoTolAndGeoTolWthMod) anE =
      Handle(StepDimTol_GeoTolAndGeoTolWthMod)::DownCast(theEnt);
    theType = STEPCAFControl_GDTProperty::GetGeomToleranceType(anE->GetToleranceType());
  }
  else if (theEnt->IsKind(STANDARD_TYPE(StepDimTol_GeoTolAndGeoTolWthDatRefAndUneqDisGeoTol)))
  {
    Handle(StepDimTol_GeoTolAndGeoTolWthDatRefAndUneqDisGeoTol) anE =
      Handle(StepDimTol_GeoTolAndGeoTolWthDatRefAndUneqDisGeoTol)::DownCast(theEnt);
    theType = STEPCAFControl_GDTProperty::GetGeomToleranceType(anE->GetToleranceType());
  }
  else if (theEnt->IsKind(STANDARD_TYPE(StepDimTol_AngularityTolerance)))
  {
    theType = XCAFDimTolObjects_GeomToleranceType_Angularity;
  }
  else if (theEnt->IsKind(STANDARD_TYPE(StepDimTol_CircularRunoutTolerance)))
  {
    theType = XCAFDimTolObjects_GeomToleranceType_CircularRunout;
  }
  else if (theEnt->IsKind(STANDARD_TYPE(StepDimTol_RoundnessTolerance)))
  {
    theType = XCAFDimTolObjects_GeomToleranceType_CircularityOrRoundness;
  }
  else if (theEnt->IsKind(STANDARD_TYPE(StepDimTol_CoaxialityTolerance)))
  {
    theType = XCAFDimTolObjects_GeomToleranceType_Coaxiality;
  }
  else if (theEnt->IsKind(STANDARD_TYPE(StepDimTol_ConcentricityTolerance)))
  {
    theType = XCAFDimTolObjects_GeomToleranceType_Concentricity;
  }
  else if (theEnt->IsKind(STANDARD_TYPE(StepDimTol_CylindricityTolerance)))
  {
    theType = XCAFDimTolObjects_GeomToleranceType_Cylindricity;
  }
  else if (theEnt->IsKind(STANDARD_TYPE(StepDimTol_FlatnessTolerance)))
  {
    theType = XCAFDimTolObjects_GeomToleranceType_Flatness;
  }
  else if (theEnt->IsKind(STANDARD_TYPE(StepDimTol_ParallelismTolerance)))
  {
    theType = XCAFDimTolObjects_GeomToleranceType_Parallelism;
  }
  else if (theEnt->IsKind(STANDARD_TYPE(StepDimTol_PerpendicularityTolerance)))
  {
    theType = XCAFDimTolObjects_GeomToleranceType_Perpendicularity;
  }
  else if (theEnt->IsKind(STANDARD_TYPE(StepDimTol_PositionTolerance)) ||
    theEnt->IsKind(STANDARD_TYPE(StepDimTol_GeoTolAndGeoTolWthDatRefAndModGeoTolAndPosTol)))
  {
    theType = XCAFDimTolObjects_GeomToleranceType_Position;
  }
  else if (theEnt->IsKind(STANDARD_TYPE(StepDimTol_LineProfileTolerance)))
  {
    theType = XCAFDimTolObjects_GeomToleranceType_ProfileOfLine;
  }
  else if (theEnt->IsKind(STANDARD_TYPE(StepDimTol_SurfaceProfileTolerance)))
  {
    theType = XCAFDimTolObjects_GeomToleranceType_ProfileOfSurface;
  }
  else if (theEnt->IsKind(STANDARD_TYPE(StepDimTol_StraightnessTolerance)))
  {
    theType = XCAFDimTolObjects_GeomToleranceType_Straightness;
  }
  else if (theEnt->IsKind(STANDARD_TYPE(StepDimTol_SymmetryTolerance)))
  {
    theType = XCAFDimTolObjects_GeomToleranceType_Symmetry;
  }
  else if (theEnt->IsKind(STANDARD_TYPE(StepDimTol_TotalRunoutTolerance)))
  {
    theType = XCAFDimTolObjects_GeomToleranceType_TotalRunout;
  }
  return Standard_True;
}
//=======================================================================
//function : setGeomTolObjectToXCAF
//purpose  : 
//=======================================================================
static void setGeomTolObjectToXCAF(const Handle(Standard_Transient)& theEnt,
  const TDF_Label& theTolL,
  const Handle(TDocStd_Document)& theDoc,
  const Handle(XSControl_WorkSession)& theWS)
{
  Handle(XCAFDoc_ShapeTool) aSTool = XCAFDoc_DocumentTool::ShapeTool(theDoc->Main());
  Handle(XCAFDoc_DimTolTool) aDGTTool = XCAFDoc_DocumentTool::DimTolTool(theDoc->Main());
  const Handle(XSControl_TransferReader) &aTR = theWS->TransferReader();
  const Handle(Transfer_TransientProcess) &aTP = aTR->TransientProcess();
  const Interface_Graph& aGraph = aTP->Graph();
  Handle(XCAFDoc_GeomTolerance) aGTol;
  if (!theTolL.FindAttribute(XCAFDoc_GeomTolerance::GetID(), aGTol))
  {
    return;
  }
  Handle(XCAFDimTolObjects_GeomToleranceObject) aTolObj = aGTol->GetObject();
  Handle(StepDimTol_GeometricTolerance) aTolEnt = Handle(StepDimTol_GeometricTolerance)::DownCast(theEnt);

  XCAFDimTolObjects_GeomToleranceType aType = XCAFDimTolObjects_GeomToleranceType_None;
  getTolType(theEnt, aType);
  aTolObj->SetType(aType);
  if (!aTolEnt->Magnitude().IsNull()) {
    //get value
    Standard_Real aVal = aTolEnt->Magnitude()->ValueComponent();
    StepBasic_Unit anUnit = aTolEnt->Magnitude()->UnitComponent();
    if (anUnit.IsNull()) return;
    if (!(anUnit.CaseNum(anUnit.Value()) == 1)) return;
    Handle(StepBasic_NamedUnit) NU = anUnit.NamedUnit();
    STEPConstruct_UnitContext anUnitCtx;
    anUnitCtx.ComputeFactors(NU);
    aVal = aVal * anUnitCtx.LengthFactor();
    aTolObj->SetValue(aVal);
  }
  //get modifiers
  XCAFDimTolObjects_GeomToleranceTypeValue aTypeV = XCAFDimTolObjects_GeomToleranceTypeValue_None;
  Interface_EntityIterator anIter = aGraph.Sharings(aTolEnt);
  for (anIter.Start(); anIter.More(); anIter.Next()) {
    if (anIter.Value()->IsKind(STANDARD_TYPE(StepDimTol_ToleranceZone))) {
      Handle(StepDimTol_ToleranceZoneForm) aForm
        = Handle(StepDimTol_ToleranceZone)::DownCast(anIter.Value())->Form();
      STEPCAFControl_GDTProperty::GetTolValueType(aForm->Name(), aTypeV);
      Interface_EntityIterator anIt = aGraph.Sharings(anIter.Value());
      for (anIt.Start(); anIt.More(); anIt.Next()) {
        if (anIt.Value()->IsKind(STANDARD_TYPE(StepDimTol_ProjectedZoneDefinition))) {
          Handle(StepDimTol_ProjectedZoneDefinition) aPZone
            = Handle(StepDimTol_ProjectedZoneDefinition)::DownCast(anIt.Value());
          if (!aPZone->ProjectionLength().IsNull())
          {
            Standard_Real aVal = aPZone->ProjectionLength()->ValueComponent();
            StepBasic_Unit anUnit = aPZone->ProjectionLength()->UnitComponent();
            if (anUnit.IsNull()) return;
            if (!(anUnit.CaseNum(anUnit.Value()) == 1)) return;
            Handle(StepBasic_NamedUnit) NU = anUnit.NamedUnit();
            STEPConstruct_UnitContext anUnitCtx;
            anUnitCtx.ComputeFactors(NU);
            aVal = aVal * anUnitCtx.LengthFactor();
            aTolObj->SetValueOfZoneModifier(aVal);
            aTolObj->SetZoneModifier(XCAFDimTolObjects_GeomToleranceZoneModif_Projected);
          }
        }
        else if (anIt.Value()->IsKind(STANDARD_TYPE(StepDimTol_RunoutZoneDefinition)))
        {
          Handle(StepDimTol_RunoutZoneDefinition) aRZone
            = Handle(StepDimTol_RunoutZoneDefinition)::DownCast(anIt.Value());
          if (!aRZone->Orientation().IsNull())
          {
            Standard_Real aVal = aRZone->Orientation()->Angle()->ValueComponent();
            StepBasic_Unit anUnit = aRZone->Orientation()->Angle()->UnitComponent();
            if (anUnit.IsNull()) continue;
            if (!(anUnit.CaseNum(anUnit.Value()) == 1)) continue;
            Handle(StepBasic_NamedUnit) NU = anUnit.NamedUnit();
            STEPConstruct_UnitContext anUnitCtx;
            anUnitCtx.ComputeFactors(NU);
            convertAngleValue(anUnitCtx, aVal);
            aTolObj->SetValueOfZoneModifier(aVal);
            aTolObj->SetZoneModifier(XCAFDimTolObjects_GeomToleranceZoneModif_Runout);
          }
        }
      }
      aTolObj->SetTypeOfValue(aTypeV);
    }
  }
  Handle(StepDimTol_HArray1OfGeometricToleranceModifier) aModifiers;
  if (aTolEnt->IsKind(STANDARD_TYPE(StepDimTol_GeometricToleranceWithModifiers)))
  {
    aModifiers = Handle(StepDimTol_GeometricToleranceWithModifiers)::DownCast(aTolEnt)->Modifiers();
  }
  else if (aTolEnt->IsKind(STANDARD_TYPE(StepDimTol_GeoTolAndGeoTolWthDatRefAndGeoTolWthMod)))
  {
    aModifiers = Handle(StepDimTol_GeoTolAndGeoTolWthDatRefAndGeoTolWthMod)
      ::DownCast(aTolEnt)->GetGeometricToleranceWithModifiers()->Modifiers();
  }
  else if (aTolEnt->IsKind(STANDARD_TYPE(StepDimTol_GeoTolAndGeoTolWthMod)))
  {
    aModifiers = Handle(StepDimTol_GeoTolAndGeoTolWthMod)
      ::DownCast(aTolEnt)->GetGeometricToleranceWithModifiers()->Modifiers();
  }
  else if (aTolEnt->IsKind(STANDARD_TYPE(StepDimTol_GeoTolAndGeoTolWthMaxTol)))
  {
    aModifiers = Handle(StepDimTol_GeoTolAndGeoTolWthMaxTol)
      ::DownCast(aTolEnt)->GetGeometricToleranceWithModifiers()->Modifiers();
  }
  else if (aTolEnt->IsKind(STANDARD_TYPE(StepDimTol_GeoTolAndGeoTolWthDatRefAndGeoTolWthMaxTol)))
  {
    aModifiers = Handle(StepDimTol_GeoTolAndGeoTolWthDatRefAndGeoTolWthMaxTol)
      ::DownCast(aTolEnt)->GetGeometricToleranceWithModifiers()->Modifiers();
  }
  if (!aModifiers.IsNull())
  {
    for (Standard_Integer i = aModifiers->Lower(); i <= aModifiers->Upper(); i++)
    {
      if (aModifiers->Value(i) == StepDimTol_GTMLeastMaterialRequirement)
        aTolObj->SetMaterialRequirementModifier(XCAFDimTolObjects_GeomToleranceMatReqModif_L);
      else if (aModifiers->Value(i) == StepDimTol_GTMMaximumMaterialRequirement)
        aTolObj->SetMaterialRequirementModifier(XCAFDimTolObjects_GeomToleranceMatReqModif_M);
      else
        aTolObj->AddModifier((XCAFDimTolObjects_GeomToleranceModif)aModifiers->Value(i));
    }
  }
  Standard_Real aVal = 0;
  StepBasic_Unit anUnit;
  if (aTolEnt->IsKind(STANDARD_TYPE(StepDimTol_GeometricToleranceWithMaximumTolerance)))
  {
    Handle(StepDimTol_GeometricToleranceWithMaximumTolerance) aMax = Handle(StepDimTol_GeometricToleranceWithMaximumTolerance)::DownCast(aTolEnt);
    aVal = aMax->MaximumUpperTolerance()->ValueComponent();
    anUnit = aMax->MaximumUpperTolerance()->UnitComponent();
  }
  else if (aTolEnt->IsKind(STANDARD_TYPE(StepDimTol_GeoTolAndGeoTolWthMaxTol)))
  {
    Handle(StepDimTol_GeoTolAndGeoTolWthMaxTol) aMax =
      Handle(StepDimTol_GeoTolAndGeoTolWthMaxTol)::DownCast(aTolEnt);
    aVal = aMax->GetMaxTolerance()->ValueComponent();
    anUnit = aMax->GetMaxTolerance()->UnitComponent();
  }
  else if (aTolEnt->IsKind(STANDARD_TYPE(StepDimTol_GeoTolAndGeoTolWthDatRefAndGeoTolWthMaxTol)))
  {
    Handle(StepDimTol_GeoTolAndGeoTolWthDatRefAndGeoTolWthMaxTol) aMax =
      Handle(StepDimTol_GeoTolAndGeoTolWthDatRefAndGeoTolWthMaxTol)::DownCast(aTolEnt);
    aVal = aMax->GetMaxTolerance()->ValueComponent();
    anUnit = aMax->GetMaxTolerance()->UnitComponent();
  }
  if (!anUnit.IsNull() && (anUnit.CaseNum(anUnit.Value()) == 1))
  {
    Handle(StepBasic_NamedUnit) NU = anUnit.NamedUnit();
    STEPConstruct_UnitContext anUnitCtx;
    anUnitCtx.ComputeFactors(NU);
    convertAngleValue(anUnitCtx, aVal);
    aTolObj->SetMaxValueModifier(aVal);
  }

  readAnnotation(aTR, theEnt, aTolObj);
  aGTol->SetObject(aTolObj);
}

//=======================================================================
//function : ReadGDTs
//purpose  : 
//=======================================================================

Standard_Boolean STEPCAFControl_Reader::ReadGDTs(const Handle(XSControl_WorkSession)& theWS,
  Handle(TDocStd_Document)& theDoc)
{
  const Handle(Interface_InterfaceModel) &aModel = theWS->Model();
  const Interface_Graph& aGraph = theWS->Graph();
  const Handle(XSControl_TransferReader) &aTR = theWS->TransferReader();
  Handle(StepData_StepModel) aSM = Handle(StepData_StepModel)::DownCast(aModel);
  Interface_EntityIterator anI = aSM->Header();
  Handle(HeaderSection_FileSchema) aH;
  for (anI.Start(); anI.More() && aH.IsNull();anI.Next())
    aH = Handle(HeaderSection_FileSchema)::DownCast(anI.Value());
  Handle(XCAFDoc_ShapeTool) aSTool = XCAFDoc_DocumentTool::ShapeTool(theDoc->Main());
  Handle(XCAFDoc_DimTolTool) aDGTTool = XCAFDoc_DocumentTool::DimTolTool(theDoc->Main());
  if (aDGTTool.IsNull()) return Standard_False;

  Standard_Integer nb = aModel->NbEntities();
  for (Standard_Integer i = 1; i <= nb; i++) {
    Handle(Standard_Transient) anEnt = aModel->Value(i);
    if (anEnt->IsKind(STANDARD_TYPE(StepShape_DimensionalSize)) ||
      anEnt->IsKind(STANDARD_TYPE(StepShape_DimensionalLocation)) ||
      anEnt->IsKind(STANDARD_TYPE(StepDimTol_GeometricTolerance))) {
      TDF_Label aGDTL = createGDTObjectInXCAF(anEnt, theDoc, theWS);
      if (!aGDTL.IsNull()) {
        if (anEnt->IsKind(STANDARD_TYPE(StepDimTol_GeometricTolerance))) {
          setGeomTolObjectToXCAF(anEnt, aGDTL, theDoc, theWS);
        }
        else {
          setDimObjectToXCAF(anEnt, aGDTL, theDoc, theWS);
        }
      }
    }
    else if (anEnt->IsKind(STANDARD_TYPE(StepVisual_DraughtingCallout)) ||
      anEnt->IsKind(STANDARD_TYPE(StepVisual_AnnotationOccurrence)))
    {
      // Protection against import presentation twice
      Handle(StepVisual_DraughtingCallout) aDC;
      for (Interface_EntityIterator anIter = aGraph.Sharings(anEnt); anIter.More() && aDC.IsNull(); anIter.Next()) {
        aDC = Handle(StepVisual_DraughtingCallout)::DownCast(anIter.Value());
      }
      if (!aDC.IsNull())
        continue;
      // Read presentations for PMIs without semantic data.
      Handle(StepAP242_DraughtingModelItemAssociation) aDMIA;
      TDF_LabelSequence aShapesL;
      for (Interface_EntityIterator anIter = aGraph.Sharings(anEnt); anIter.More() && aDMIA.IsNull(); anIter.Next()) {
        aDMIA = Handle(StepAP242_DraughtingModelItemAssociation)::DownCast(anIter.Value());
      }
      if (!aDMIA.IsNull()) {
        // Check entity, skip all, attached to GDTs
        Handle(StepRepr_ShapeAspect) aDefinition = aDMIA->Definition().ShapeAspect();
        if (!aDefinition.IsNull()) {
          Standard_Boolean isConnectedToGDT = Standard_False;
          // Skip if definition is a datum
          if (aDefinition->IsKind(STANDARD_TYPE(StepDimTol_Datum)) ||
            aDefinition->IsKind(STANDARD_TYPE(StepDimTol_DatumTarget)) ||
            aDefinition->IsKind(STANDARD_TYPE(StepDimTol_DatumFeature)) ||
            aDefinition->IsKind(STANDARD_TYPE(StepRepr_CompShAspAndDatumFeatAndShAsp))) {
            isConnectedToGDT = Standard_True;
          }
          // Skip if any GDT is applied to definition
          for (Interface_EntityIterator anIter = aGraph.Sharings(aDefinition); anIter.More() && !isConnectedToGDT; anIter.Next()) {
            if (anIter.Value()->IsKind(STANDARD_TYPE(StepShape_DimensionalSize)) ||
              anIter.Value()->IsKind(STANDARD_TYPE(StepShape_DimensionalLocation)) ||
              anIter.Value()->IsKind(STANDARD_TYPE(StepDimTol_GeometricTolerance))) {
              isConnectedToGDT = Standard_True;
              continue;
            }
            Handle(StepRepr_ShapeAspectRelationship) aSAR = Handle(StepRepr_ShapeAspectRelationship)::DownCast(anIter.Value());
            if (!aSAR.IsNull()) {
              Handle(StepRepr_ShapeAspect) aSA = aSAR->RelatedShapeAspect();
              if (!aSA.IsNull()) {
                if (aSA->IsKind(STANDARD_TYPE(StepDimTol_Datum)) ||
                  aSA->IsKind(STANDARD_TYPE(StepDimTol_DatumTarget)) ||
                  aSA->IsKind(STANDARD_TYPE(StepDimTol_DatumFeature)) ||
                  aSA->IsKind(STANDARD_TYPE(StepRepr_CompShAspAndDatumFeatAndShAsp))) {
                  isConnectedToGDT = Standard_True;
                }
                for (Interface_EntityIterator aDimIter = aGraph.Sharings(aSA); aDimIter.More() && !isConnectedToGDT; aDimIter.Next()) {
                  if (aDimIter.Value()->IsKind(STANDARD_TYPE(StepShape_DimensionalSize)) ||
                    aDimIter.Value()->IsKind(STANDARD_TYPE(StepShape_DimensionalLocation)) ||
                    aDimIter.Value()->IsKind(STANDARD_TYPE(StepDimTol_GeometricTolerance))) {
                    isConnectedToGDT = Standard_True;
                    continue;
                  }
                }
              }
            }
          }
          if (isConnectedToGDT)
            continue;
        }
        else if (aDMIA->Definition().PropertyDefinition().IsNull())
          continue;

        // Get shapes
        NCollection_Sequence<Handle(StepRepr_ShapeAspect)> aSAs;
        collectShapeAspect(aDefinition, theWS, aSAs);
        for (Standard_Integer aSAIt = 1; aSAIt <= aSAs.Length(); aSAIt++) {
          Handle(StepAP242_GeometricItemSpecificUsage) aGISU;
          for (Interface_EntityIterator anIter = aGraph.Sharings(aSAs.Value(aSAIt)); anIter.More() && aGISU.IsNull(); anIter.Next())
            aGISU = Handle(StepAP242_GeometricItemSpecificUsage)::DownCast(anIter.Value());
          if (aGISU.IsNull())
            continue;
          for (Standard_Integer anItemIt = 1; anItemIt <= aGISU->NbIdentifiedItem(); anItemIt++) {
            TDF_Label aLabel = getShapeLabel(aGISU->IdentifiedItemValue(anItemIt), theWS, XCAFDoc_DocumentTool::ShapeTool(theDoc->Main()));
            if (!aLabel.IsNull())
              aShapesL.Append(aLabel);
          }
        }
      }
      Standard_Boolean isCommonLabel = (aShapesL.Length() == 0);

      // Calculate unit
      Standard_Real aFact = 1.0;
      if (!aDMIA.IsNull())
      {
        XSAlgo::AlgoContainer()->PrepareForTransfer();
        STEPControl_ActorRead anActor;
        Handle(Transfer_TransientProcess) aTP = aTR->TransientProcess();
        anActor.PrepareUnits(aDMIA->UsedRepresentation(), aTP);
        aFact = UnitsMethods::LengthFactor();
      }

      // Presentation
      TopoDS_Shape aPresentation;
      Handle(TCollection_HAsciiString) aPresentName;
      Bnd_Box aBox;
      if (!readPMIPresentation(anEnt, aTR, aFact, aPresentation, aPresentName, aBox))
        continue;
      // Annotation plane
      Handle(StepVisual_AnnotationPlane) anAnPlane;
      for (Interface_EntityIterator anIter = aGraph.Sharings(anEnt); anIter.More() && anAnPlane.IsNull(); anIter.Next())
        anAnPlane = Handle(StepVisual_AnnotationPlane)::DownCast(anIter.Value());

      // Set object to XCAF
      TDF_Label aGDTL = aDGTTool->AddDimension();
      myGDTMap.Bind(anEnt, aGDTL);
      aDGTTool->Lock(aGDTL);
      Handle(XCAFDimTolObjects_DimensionObject) aDimObj = new XCAFDimTolObjects_DimensionObject();
      Handle(XCAFDoc_Dimension) aDim = XCAFDoc_Dimension::Set(aGDTL);
      TCollection_AsciiString aStr("DGT:");
      if (isCommonLabel) {
        aStr.AssignCat("Common_label");
        aDimObj->SetType(XCAFDimTolObjects_DimensionType_CommonLabel);
      }
      else {
        aStr.AssignCat("Dimension");
        aDimObj->SetType(XCAFDimTolObjects_DimensionType_DimensionPresentation);
      }
      TDataStd_Name::Set(aGDTL, aStr);
      TDF_LabelSequence anEmptySeq2;
      aDGTTool->SetDimension(aShapesL, anEmptySeq2, aGDTL);
      gp_Ax2 aPlaneAxes;
      if (!anAnPlane.IsNull()) {
        if (readAnnotationPlane(anAnPlane, aPlaneAxes))
          aDimObj->SetPlane(aPlaneAxes);
      }
      aDimObj->SetPresentation(aPresentation, aPresentName);
      aDim->SetObject(aDimObj);
    }
  }
  return Standard_True;
}


//=======================================================================
//function : FindSolidForPDS
//purpose  : auxilary
//=======================================================================

static Handle(StepShape_SolidModel) FindSolidForPDS(const Handle(StepRepr_ProductDefinitionShape) &PDS,
  const Interface_Graph &graph)
{
  Handle(StepShape_SolidModel) SM;
  Interface_EntityIterator subs = graph.Sharings(PDS);
  Handle(StepShape_ShapeRepresentation) SR;
  for (subs.Start(); subs.More() && SM.IsNull(); subs.Next()) {
    Handle(StepShape_ShapeDefinitionRepresentation) SDR =
      Handle(StepShape_ShapeDefinitionRepresentation)::DownCast(subs.Value());
    if (SDR.IsNull()) continue;
    SR = Handle(StepShape_ShapeRepresentation)::DownCast(SDR->UsedRepresentation());
    if (SR.IsNull()) continue;
    for (Standard_Integer i = 1; i <= SR->NbItems() && SM.IsNull(); i++) {
      SM = Handle(StepShape_SolidModel)::DownCast(SR->ItemsValue(i));
    }
    if (SM.IsNull()) {
      Interface_EntityIterator subs1 = graph.Sharings(SR);
      for (subs1.Start(); subs1.More() && SM.IsNull(); subs1.Next()) {
        Handle(StepRepr_RepresentationRelationship) RR =
          Handle(StepRepr_RepresentationRelationship)::DownCast(subs1.Value());
        if (RR.IsNull()) continue;
        Handle(StepShape_ShapeRepresentation) SR2;
        if (RR->Rep1() == SR) SR2 = Handle(StepShape_ShapeRepresentation)::DownCast(RR->Rep2());
        else SR2 = Handle(StepShape_ShapeRepresentation)::DownCast(RR->Rep1());
        if (SR2.IsNull()) continue;
        for (Standard_Integer i2 = 1; i2 <= SR2->NbItems() && SM.IsNull(); i2++) {
          SM = Handle(StepShape_SolidModel)::DownCast(SR2->ItemsValue(i2));
        }
      }
    }
  }
  return SM;
}


//=======================================================================
//function : ReadMaterials
//purpose  : 
//=======================================================================

Standard_Boolean STEPCAFControl_Reader::ReadMaterials(const Handle(XSControl_WorkSession) &WS,
  Handle(TDocStd_Document)& Doc,
  const Handle(TColStd_HSequenceOfTransient) &SeqPDS) const
{
  const Handle(XSControl_TransferReader) &TR = WS->TransferReader();
  const Handle(Transfer_TransientProcess) &TP = TR->TransientProcess();
  Handle(XCAFDoc_ShapeTool) STool = XCAFDoc_DocumentTool::ShapeTool(Doc->Main());
  Handle(XCAFDoc_MaterialTool) MatTool = XCAFDoc_DocumentTool::MaterialTool(Doc->Main());
  if (MatTool.IsNull()) return Standard_False;

  const Interface_Graph& graph = TP->Graph();
  for (Standard_Integer i = 1; i <= SeqPDS->Length(); i++) {
    Handle(StepRepr_ProductDefinitionShape) PDS =
      Handle(StepRepr_ProductDefinitionShape)::DownCast(SeqPDS->Value(i));
    if (PDS.IsNull())
      continue;
    Handle(StepBasic_ProductDefinition) aProdDef = PDS->Definition().ProductDefinition();
    if (aProdDef.IsNull())
      continue;
    Handle(TCollection_HAsciiString) aName = new TCollection_HAsciiString("");
    Handle(TCollection_HAsciiString) aDescription = new TCollection_HAsciiString("");
    Handle(TCollection_HAsciiString) aDensName = new TCollection_HAsciiString("");
    Handle(TCollection_HAsciiString) aDensValType = new TCollection_HAsciiString("");
    Standard_Real aDensity = 0;
    Interface_EntityIterator subs = graph.Sharings(aProdDef);
    for (subs.Start(); subs.More(); subs.Next()) {
      Handle(StepRepr_PropertyDefinition) PropD =
        Handle(StepRepr_PropertyDefinition)::DownCast(subs.Value());
      if (PropD.IsNull()) continue;
      Interface_EntityIterator subs1 = graph.Sharings(PropD);
      for (subs1.Start(); subs1.More(); subs1.Next()) {
        Handle(StepRepr_PropertyDefinitionRepresentation) PDR =
          Handle(StepRepr_PropertyDefinitionRepresentation)::DownCast(subs1.Value());
        if (PDR.IsNull()) continue;
        Handle(StepRepr_Representation) Repr = PDR->UsedRepresentation();
        if (Repr.IsNull()) continue;
        Standard_Integer ir;
        for (ir = 1; ir <= Repr->NbItems(); ir++) {
          Handle(StepRepr_RepresentationItem) RI = Repr->ItemsValue(ir);
          if (RI.IsNull()) continue;
          if (RI->IsKind(STANDARD_TYPE(StepRepr_DescriptiveRepresentationItem))) {
            // find name and description for material
            Handle(StepRepr_DescriptiveRepresentationItem) DRI =
              Handle(StepRepr_DescriptiveRepresentationItem)::DownCast(RI);
            aName = DRI->Name();

            aDescription = DRI->Description();
            if (aName.IsNull())
              aName = aDescription;
          }
          if (RI->IsKind(STANDARD_TYPE(StepRepr_MeasureRepresentationItem))) {
            // try to find density for material
            Handle(StepRepr_MeasureRepresentationItem) MRI =
              Handle(StepRepr_MeasureRepresentationItem)::DownCast(RI);
            aDensity = MRI->Measure()->ValueComponent();
            aDensName = MRI->Name();
            aDensValType = new TCollection_HAsciiString(MRI->Measure()->ValueComponentMember()->Name());
            StepBasic_Unit aUnit = MRI->Measure()->UnitComponent();
            if (!aUnit.IsNull()) {
              Handle(StepBasic_DerivedUnit) DU = aUnit.DerivedUnit();
              if (DU.IsNull()) continue;
              for (Standard_Integer idu = 1; idu <= DU->NbElements(); idu++) {
                Handle(StepBasic_DerivedUnitElement) DUE = DU->ElementsValue(idu);
                Handle(StepBasic_NamedUnit) NU = DUE->Unit();
                if (NU->IsKind(STANDARD_TYPE(StepBasic_ConversionBasedUnitAndLengthUnit)) ||
                  NU->IsKind(STANDARD_TYPE(StepBasic_SiUnitAndLengthUnit)))
                {
                  STEPConstruct_UnitContext anUnitCtx;
                  anUnitCtx.ComputeFactors(NU);
                  aDensity = aDensity / (anUnitCtx.LengthFactor()*anUnitCtx.LengthFactor()*anUnitCtx.LengthFactor());
                  // transfer length value for Density from millimeter to santimeter
                  // in order to result density has dimension gram/(sm*sm*sm)
                  aDensity = aDensity*1000. / (UnitsMethods::GetCasCadeLengthUnit()
                    * UnitsMethods::GetCasCadeLengthUnit() * UnitsMethods::GetCasCadeLengthUnit());
                }
                if (NU->IsKind(STANDARD_TYPE(StepBasic_ConversionBasedUnitAndMassUnit))) {
                  Standard_Real afact = 1.;
                  if (GetMassConversionFactor(NU, afact))
                  {
                    aDensity = aDensity*afact;
                  }
                }
              }
            }
          }
        }
      }
    }

    if (aName.IsNull() || aName->Length() == 0)
      continue;
    // find shape label amd create Material link
    TopoDS_Shape aSh;
    Handle(StepShape_SolidModel) SM = FindSolidForPDS(PDS, graph);
    if (!SM.IsNull()) {
      Standard_Integer index = TP->MapIndex(SM);
      if (index > 0) {
        Handle(Transfer_Binder) binder = TP->MapItem(index);
        if (!binder.IsNull())
          aSh = TransferBRep::ShapeResult(binder);
      }
    }
    if (aSh.IsNull()) continue;
    TDF_Label shL;
    if (!STool->Search(aSh, shL, Standard_True, Standard_True, Standard_True)) continue;
    MatTool->SetMaterial(shL, aName, aDescription, aDensity, aDensName, aDensValType);
  }

  return Standard_True;
}

//=======================================================================
//function : collectViewShapes
//purpose  : collect all labels of representations in given representation
//=======================================================================

void collectViewShapes(const Handle(XSControl_WorkSession)& theWS,
  const Handle(TDocStd_Document)& theDoc,
  const Handle(StepRepr_Representation) theRepr,
  TDF_LabelSequence& theShapes)
{
  Handle(XSControl_TransferReader) aTR = theWS->TransferReader();
  Handle(Transfer_TransientProcess) aTP = aTR->TransientProcess();
  const Interface_Graph& aGraph = aTP->Graph();
  Handle(XCAFDoc_ShapeTool) aSTool = XCAFDoc_DocumentTool::ShapeTool(theDoc->Main());
  Standard_Integer anIndex = aTP->MapIndex(theRepr);
  TopoDS_Shape aSh;
  if (anIndex > 0) {
    Handle(Transfer_Binder) aBinder = aTP->MapItem(anIndex);
    aSh = TransferBRep::ShapeResult(aBinder);
  }
  if (!aSh.IsNull()) {
    TDF_Label aShL;
    aSTool->FindShape(aSh, aShL);
    if (!aShL.IsNull())
      theShapes.Append(aShL);
  }
  Interface_EntityIterator anIter = aGraph.Sharings(theRepr);
  for (; anIter.More(); anIter.Next()) {
    if (!anIter.Value()->IsKind(STANDARD_TYPE(StepRepr_RepresentationRelationship)))
      continue;
    Handle(StepRepr_RepresentationRelationship) aReprRelationship = Handle(StepRepr_RepresentationRelationship)::DownCast(anIter.Value());
    if (!aReprRelationship->Rep1().IsNull() && aReprRelationship->Rep1() != theRepr)
      collectViewShapes(theWS, theDoc, aReprRelationship->Rep1(), theShapes);
  }
}

//=======================================================================
//function : buildClippingPlanes
//purpose  :
//=======================================================================
Handle(TCollection_HAsciiString) buildClippingPlanes(const Handle(StepGeom_GeometricRepresentationItem)& theClippingCameraModel,
  TDF_LabelSequence& theClippingPlanes,
  const Handle(XCAFDoc_ClippingPlaneTool) theTool)
{
  Handle(TCollection_HAsciiString) anExpression = new TCollection_HAsciiString();
  NCollection_Sequence<Handle(StepGeom_GeometricRepresentationItem)> aPlanes;
  Handle(TCollection_HAsciiString) anOperation = new TCollection_HAsciiString("*");

  // Store operands
  if (theClippingCameraModel->IsKind(STANDARD_TYPE(StepVisual_CameraModelD3MultiClipping))) {
    Handle(StepVisual_CameraModelD3MultiClipping) aCameraModel =
      Handle(StepVisual_CameraModelD3MultiClipping)::DownCast(theClippingCameraModel);

    if (aCameraModel->ShapeClipping().IsNull())
      return anExpression;

    // Root of clipping planes tree
    if (aCameraModel->ShapeClipping()->Length() == 1) {
      Handle(StepVisual_CameraModelD3MultiClippingUnion) aCameraModelUnion =
        aCameraModel->ShapeClipping()->Value(1).CameraModelD3MultiClippingUnion();
      if (!aCameraModelUnion.IsNull())
        return buildClippingPlanes(aCameraModelUnion, theClippingPlanes, theTool);
    }
    for (Standard_Integer i = 1; i <= aCameraModel->ShapeClipping()->Length(); i++) {
      aPlanes.Append(Handle(StepGeom_GeometricRepresentationItem)::DownCast(aCameraModel->ShapeClipping()->Value(i).Value()));
    }
  }
  else if (theClippingCameraModel->IsKind(STANDARD_TYPE(StepVisual_CameraModelD3MultiClippingUnion))) {
    Handle(StepVisual_CameraModelD3MultiClippingUnion) aCameraModel =
      Handle(StepVisual_CameraModelD3MultiClippingUnion)::DownCast(theClippingCameraModel);
    anOperation = new TCollection_HAsciiString("+");
    for (Standard_Integer i = 1; i <= aCameraModel->ShapeClipping()->Length(); i++) {
      aPlanes.Append(Handle(StepGeom_GeometricRepresentationItem)::DownCast(aCameraModel->ShapeClipping()->Value(i).Value()));
    }
  }
  else if (theClippingCameraModel->IsKind(STANDARD_TYPE(StepVisual_CameraModelD3MultiClippingIntersection))) {
    Handle(StepVisual_CameraModelD3MultiClippingIntersection) aCameraModel =
      Handle(StepVisual_CameraModelD3MultiClippingIntersection)::DownCast(theClippingCameraModel);
    for (Standard_Integer i = 1; i <= aCameraModel->ShapeClipping()->Length(); i++) {
      aPlanes.Append(Handle(StepGeom_GeometricRepresentationItem)::DownCast(aCameraModel->ShapeClipping()->Value(i).Value()));
    }
  }
  // Build expression
  anExpression->AssignCat("(");
  for (Standard_Integer i = 1; i <= aPlanes.Length(); i++) {
    Handle(StepGeom_Plane) aPlaneEnt = Handle(StepGeom_Plane)::DownCast(aPlanes.Value(i));
    if (!aPlaneEnt.IsNull()) {
      Handle(Geom_Plane) aPlane = StepToGeom::MakePlane(aPlaneEnt);
      if (!aPlane.IsNull()) {
        TDF_Label aPlaneL = theTool->AddClippingPlane(aPlane->Pln(), aPlaneEnt->Name());
        theClippingPlanes.Append(aPlaneL);
        TCollection_AsciiString anEntry;
        TDF_Tool::Entry(aPlaneL, anEntry);
        anExpression->AssignCat(new TCollection_HAsciiString(anEntry));
      }
    }
    else {
      anExpression->AssignCat(buildClippingPlanes(aPlanes.Value(i), theClippingPlanes, theTool));
    }
    anExpression->AssignCat(anOperation);
  }
  // Insert brace instead of operation after last operand.
  anExpression->SetValue(anExpression->Length(), ')');
  return anExpression;
}


//=======================================================================
//function : ReadViews
//purpose  :
//=======================================================================
Standard_Boolean STEPCAFControl_Reader::ReadViews(const Handle(XSControl_WorkSession)& theWS, Handle(TDocStd_Document)& theDoc) const
{
  const Handle(Interface_InterfaceModel) &aModel = theWS->Model();
  Handle(XCAFDoc_ShapeTool) aSTool = XCAFDoc_DocumentTool::ShapeTool(theDoc->Main());
  Handle(XCAFDoc_DimTolTool) aDGTTool = XCAFDoc_DocumentTool::DimTolTool(theDoc->Main());
  Handle(XCAFDoc_ViewTool) aViewTool = XCAFDoc_DocumentTool::ViewTool(theDoc->Main());
  if (aDGTTool.IsNull()) return Standard_False;

  Standard_Integer nb = aModel->NbEntities();
  for (Standard_Integer i = 1; i <= nb; i++) {
    Handle(Standard_Transient) anEnt = aModel->Value(i);
    if (!anEnt->IsKind(STANDARD_TYPE(StepVisual_CameraModelD3)))
      continue;
    Handle(XCAFView_Object) anObj = new XCAFView_Object();
    // Import attributes of view
    Handle(StepVisual_CameraModelD3) aCameraModel = Handle(StepVisual_CameraModelD3)::DownCast(anEnt);

    const Handle(XSControl_TransferReader)& aTR = theWS->TransferReader();
    Handle(Transfer_TransientProcess) aTP = aTR->TransientProcess();
    const Interface_Graph& aGraph = aTP->Graph();
    // find the proper DraughtingModel
    Interface_EntityIterator subs = aGraph.Sharings(aCameraModel);
    Handle(StepVisual_DraughtingModel) aDModel;
    for (subs.Start(); subs.More() && aDModel.IsNull(); subs.Next())
    {
      if (!subs.Value()->IsKind(STANDARD_TYPE(StepVisual_DraughtingModel)))
      {
        continue;
      }
      aDModel = Handle(StepVisual_DraughtingModel)::DownCast(subs.Value());
    }
    if (!aDModel.IsNull())
    {
      XSAlgo::AlgoContainer()->PrepareForTransfer();
      STEPControl_ActorRead anActor;
      anActor.PrepareUnits(aDModel, aTP);
    }

    anObj->SetName(aCameraModel->Name());
    Handle(Geom_Axis2Placement) anAxis = StepToGeom::MakeAxis2Placement(aCameraModel->ViewReferenceSystem());
    anObj->SetViewDirection(anAxis->Direction());
    anObj->SetUpDirection(anAxis->Direction() ^ anAxis->XDirection());
    Handle(StepVisual_ViewVolume) aViewVolume = aCameraModel->PerspectiveOfVolume();
    XCAFView_ProjectionType aType = XCAFView_ProjectionType_NoCamera;
    if (aViewVolume->ProjectionType() == StepVisual_copCentral)
      aType = XCAFView_ProjectionType_Central;
    else if (aViewVolume->ProjectionType() == StepVisual_copParallel)
      aType = XCAFView_ProjectionType_Parallel;
    anObj->SetType(aType);
    Handle(Geom_CartesianPoint) aPoint = StepToGeom::MakeCartesianPoint(aViewVolume->ProjectionPoint());
    anObj->SetProjectionPoint(aPoint->Pnt());
    anObj->SetZoomFactor(aViewVolume->ViewPlaneDistance());
    anObj->SetWindowHorizontalSize(aViewVolume->ViewWindow()->SizeInX());
    anObj->SetWindowVerticalSize(aViewVolume->ViewWindow()->SizeInY());
    if (aViewVolume->FrontPlaneClipping())
      anObj->SetFrontPlaneDistance(aViewVolume->FrontPlaneDistance());
    if (aViewVolume->BackPlaneClipping())
      anObj->SetBackPlaneDistance(aViewVolume->BackPlaneDistance());
    anObj->SetViewVolumeSidesClipping(aViewVolume->ViewVolumeSidesClipping());
    // Clipping plane
    Handle(StepVisual_CameraModelD3MultiClipping) aClippingCameraModel =
      Handle(StepVisual_CameraModelD3MultiClipping)::DownCast(aCameraModel);
    TDF_LabelSequence aClippingPlanes;
    if (!aClippingCameraModel.IsNull()) {
      Handle(TCollection_HAsciiString) aClippingExpression;
      Handle(XCAFDoc_ClippingPlaneTool) aClippingPlaneTool = XCAFDoc_DocumentTool::ClippingPlaneTool(theDoc->Main());
      aClippingExpression = buildClippingPlanes(aClippingCameraModel, aClippingPlanes, aClippingPlaneTool);
      anObj->SetClippingExpression(aClippingExpression);
    }

    // Collect shapes and GDTs
    if (aDModel.IsNull())
      return Standard_False;
    TDF_LabelSequence aShapes, aGDTs;
    Interface_EntityIterator anIter = aGraph.Shareds(aDModel);
    for (; anIter.More(); anIter.Next()) {
      if (anIter.Value()->IsKind(STANDARD_TYPE(StepRepr_MappedItem))) {
        Handle(StepRepr_MappedItem) anItem = Handle(StepRepr_MappedItem)::DownCast(anIter.Value());
        Handle(StepRepr_Representation) aRepr = anItem->MappingSource()->MappedRepresentation();
        collectViewShapes(theWS, theDoc, aRepr, aShapes);
      }
      else if (anIter.Value()->IsKind(STANDARD_TYPE(StepVisual_AnnotationOccurrence)) ||
        anIter.Value()->IsKind(STANDARD_TYPE(StepVisual_DraughtingCallout))) {
        Interface_EntityIterator aDMIAIter = aGraph.Sharings(anIter.Value());
        for (; aDMIAIter.More(); aDMIAIter.Next()) {
          if (!aDMIAIter.Value()->IsKind(STANDARD_TYPE(StepAP242_DraughtingModelItemAssociation)))
            continue;
          Handle(StepAP242_DraughtingModelItemAssociation) aDMIA =
            Handle(StepAP242_DraughtingModelItemAssociation)::DownCast(aDMIAIter.Value());
          TDF_Label aGDTL;
          Standard_Boolean isFind = myGDTMap.Find(aDMIA->Definition().Value(), aGDTL);
          if (!isFind) {
            isFind = myGDTMap.Find(anIter.Value(), aGDTL);
          }
          if (isFind)
            aGDTs.Append(aGDTL);
        }
      }
      else if (anIter.Value()->IsKind(STANDARD_TYPE(StepVisual_AnnotationPlane))) {
        Handle(StepVisual_AnnotationPlane) aPlane = Handle(StepVisual_AnnotationPlane)::DownCast(anIter.Value());
        for (Standard_Integer j = 1; j <= aPlane->NbElements(); j++) {
          Interface_EntityIterator aDMIAIter = aGraph.Sharings(anIter.Value());
          for (; aDMIAIter.More(); aDMIAIter.Next()) {
            if (!aDMIAIter.Value()->IsKind(STANDARD_TYPE(StepAP242_DraughtingModelItemAssociation)))
              continue;
            Handle(StepAP242_DraughtingModelItemAssociation) aDMIA =
              Handle(StepAP242_DraughtingModelItemAssociation)::DownCast(aDMIAIter.Value());
            TDF_Label aGDTL;
            Standard_Boolean isFind = myGDTMap.Find(aDMIA->Definition().Value(), aGDTL);
            if (isFind)
              aGDTs.Append(aGDTL);
          }
        }
      }
    }
    TDF_Label aViewL = aViewTool->AddView();
    Handle(XCAFDoc_View) aView = XCAFDoc_View::Set(aViewL);
    aView->SetObject(anObj);
    aViewTool->SetView(aShapes, aGDTs, aClippingPlanes, aViewL);
    aViewTool->Lock(aViewL);
  }
  return Standard_True;
}

//=======================================================================
//function : SettleShapeData
//purpose  :
//=======================================================================

TDF_Label STEPCAFControl_Reader::SettleShapeData(const Handle(StepRepr_RepresentationItem)& theItem,
  const TDF_Label& theLab,
  const Handle(XCAFDoc_ShapeTool)& theShapeTool,
  const Handle(Transfer_TransientProcess)& TP) const
{
  TDF_Label aResult = theLab;

  Handle(TCollection_HAsciiString) hName = theItem->Name();
  if (hName.IsNull() || hName->IsEmpty())
    return aResult;

  Handle(Transfer_Binder) aBinder = TP->Find(theItem);
  if (aBinder.IsNull())
    return aResult;

  TopoDS_Shape aShape = TransferBRep::ShapeResult(aBinder);
  if (aShape.IsNull())
    return aResult;

  // Allocate sub-Label
  aResult = theShapeTool->AddSubShape(theLab, aShape);
  if (aResult.IsNull())
    return aResult;

  TCollection_AsciiString aName = hName->String();
  TDataStd_Name::Set(aResult, aName);
  theShapeTool->SetShape(aResult, aShape);

  return aResult;
}

//=======================================================================
//function : collectRepresentationItems
//purpose  : recursive collection of representation items for given representation 
//           with all representations, related to it.
//=======================================================================

void collectRepresentationItems(const Interface_Graph& theGraph,
  const Handle(StepShape_ShapeRepresentation)& theRepresentation,
  NCollection_Sequence<Handle(StepRepr_RepresentationItem)>& theItems)
{
  Handle(StepRepr_HArray1OfRepresentationItem) aReprItems = theRepresentation->Items();
  for (Standard_Integer itemIt = aReprItems->Lower(); itemIt <= aReprItems->Upper(); itemIt++)
    theItems.Append(aReprItems->Value(itemIt));

  Interface_EntityIterator entIt = theGraph.TypedSharings(theRepresentation, STANDARD_TYPE(StepRepr_RepresentationRelationship));
  for (entIt.Start(); entIt.More(); entIt.Next())
  {
    Handle(StepRepr_RepresentationRelationship) aRelationship = Handle(StepRepr_RepresentationRelationship)::DownCast(entIt.Value());
    if (aRelationship->Rep1() == theRepresentation)
    {
      Handle(StepShape_ShapeRepresentation)
        aRepr = Handle(StepShape_ShapeRepresentation)::DownCast(aRelationship->Rep2());
      if (!aRepr.IsNull())
        collectRepresentationItems(theGraph, aRepr, theItems);
    }
  }
}

//=======================================================================
//function : ExpandSubShapes
//purpose  :
//=======================================================================

void STEPCAFControl_Reader::ExpandSubShapes(const Handle(XCAFDoc_ShapeTool)& ShapeTool,
  const XCAFDoc_DataMapOfShapeLabel& ShapeLabelMap,
  const STEPCAFControl_DataMapOfShapePD& ShapePDMap) const
{
  const Handle(Transfer_TransientProcess)& TP = Reader().WS()->TransferReader()->TransientProcess();
  NCollection_DataMap<TopoDS_Shape, Handle(TCollection_HAsciiString)> ShapeNameMap;
  TColStd_MapOfTransient aRepItems;

  // Read translation control variables
  Standard_Boolean doReadSNames = (Interface_Static::IVal("read.stepcaf.subshapes.name") > 0);

  if (!doReadSNames)
    return;

  const Interface_Graph& Graph = Reader().WS()->Graph();

  for (STEPCAFControl_DataMapIteratorOfDataMapOfShapePD it(ShapePDMap); it.More(); it.Next())
  {
    const TopoDS_Shape& aRootShape = it.Key();
    const Handle(StepBasic_ProductDefinition)& aPDef = it.Value();
    if (aPDef.IsNull())
      continue;

    // Find SDR by Product
    Handle(StepShape_ShapeDefinitionRepresentation) aSDR;
    Interface_EntityIterator entIt = Graph.TypedSharings(aPDef, STANDARD_TYPE(StepShape_ShapeDefinitionRepresentation));
    for (entIt.Start(); entIt.More(); entIt.Next())
    {
      const Handle(Standard_Transient)& aReferer = entIt.Value();
      aSDR = Handle(StepShape_ShapeDefinitionRepresentation)::DownCast(aReferer);
      if (!aSDR.IsNull())
        break;
    }

    if (aSDR.IsNull())
      continue;

    // Access shape representation
    Handle(StepShape_ShapeRepresentation)
      aShapeRepr = Handle(StepShape_ShapeRepresentation)::DownCast(aSDR->UsedRepresentation());

    if (aShapeRepr.IsNull())
      continue;

    // Access representation items
    NCollection_Sequence<Handle(StepRepr_RepresentationItem)> aReprItems;
    collectRepresentationItems(Graph, aShapeRepr, aReprItems);

    if (aReprItems.Length() == 0)
      continue;

    if (!ShapeLabelMap.IsBound(aRootShape))
      continue;

    TDF_Label aRootLab = ShapeLabelMap.Find(aRootShape);
    // Do not add subshapes to assembly,
    // they will be processed with corresponding Shape_Product_Definition of necessary part.
    if (ShapeTool->IsAssembly(aRootLab))
      continue;

    StepRepr_SequenceOfRepresentationItem aMSBSeq;
    StepRepr_SequenceOfRepresentationItem aSBSMSeq;

    // Iterate over the top level representation items collecting the
    // topological containers to expand
    for (Standard_Integer i = 1; i <= aReprItems.Length(); ++i)
    {
      Handle(StepRepr_RepresentationItem) aTRepr = aReprItems.Value(i);
      if (aTRepr->IsKind(STANDARD_TYPE(StepShape_ManifoldSolidBrep)))
        aMSBSeq.Append(aTRepr);
      else if (aTRepr->IsKind(STANDARD_TYPE(StepShape_ShellBasedSurfaceModel)))
        aSBSMSeq.Append(aTRepr);
    }

    // Insert intermediate OCAF Labels for SOLIDs in case there are more
    // than one Manifold Solid BRep in the Shape Representation
    Standard_Boolean doInsertSolidLab = (aMSBSeq.Length() > 1);

    // Expand Manifold Solid BReps
    for (Standard_Integer i = 1; i <= aMSBSeq.Length(); ++i)
    {
      // Put additional Label for SOLID
      if (doInsertSolidLab)
        SettleShapeData(aMSBSeq.Value(i), aRootLab, ShapeTool, TP);

      ExpandManifoldSolidBrep(aRootLab, aMSBSeq.Value(i), TP, ShapeTool);
    }

    // Expand Shell-Based Surface Models
    for (Standard_Integer i = 1; i <= aSBSMSeq.Length(); ++i)
      ExpandSBSM(aRootLab, aSBSMSeq.Value(i), TP, ShapeTool);
  }
}

//=======================================================================
//function : ExpandManifoldSolidBrep
//purpose  :
//=======================================================================

void STEPCAFControl_Reader::ExpandManifoldSolidBrep(TDF_Label& ShapeLab,
  const Handle(StepRepr_RepresentationItem)& Repr,
  const Handle(Transfer_TransientProcess)& TP,
  const Handle(XCAFDoc_ShapeTool)& ShapeTool) const
{
  // Access outer shell
  Handle(StepShape_ManifoldSolidBrep) aMSB = Handle(StepShape_ManifoldSolidBrep)::DownCast(Repr);
  Handle(StepShape_ConnectedFaceSet) aShell = aMSB->Outer();

  // Expand shell contents to CAF tree
  ExpandShell(aShell, ShapeLab, TP, ShapeTool);
}

//=======================================================================
//function : ExpandSBSM
//purpose  :
//=======================================================================

void STEPCAFControl_Reader::ExpandSBSM(TDF_Label& ShapeLab,
  const Handle(StepRepr_RepresentationItem)& Repr,
  const Handle(Transfer_TransientProcess)& TP,
  const Handle(XCAFDoc_ShapeTool)& ShapeTool) const
{
  Handle(StepShape_ShellBasedSurfaceModel) aSBSM = Handle(StepShape_ShellBasedSurfaceModel)::DownCast(Repr);

  // Access boundary shells
  Handle(StepShape_HArray1OfShell) aShells = aSBSM->SbsmBoundary();
  for (Standard_Integer s = aShells->Lower(); s <= aShells->Upper(); ++s)
  {
    const StepShape_Shell& aShell = aShells->Value(s);
    Handle(StepShape_ConnectedFaceSet) aCFS;
    Handle(StepShape_OpenShell) anOpenShell = aShell.OpenShell();
    Handle(StepShape_ClosedShell) aClosedShell = aShell.ClosedShell();

    if (!anOpenShell.IsNull())
      aCFS = anOpenShell;
    else
      aCFS = aClosedShell;

    ExpandShell(aCFS, ShapeLab, TP, ShapeTool);
  }
}

//=======================================================================
//function : ExpandShell
//purpose  :
//=======================================================================

void STEPCAFControl_Reader::ExpandShell(const Handle(StepShape_ConnectedFaceSet)& Shell,
  TDF_Label& RootLab,
  const Handle(Transfer_TransientProcess)& TP,
  const Handle(XCAFDoc_ShapeTool)& ShapeTool) const
{
  // Record CAF data
  SettleShapeData(Shell, RootLab, ShapeTool, TP);

  // Access faces
  Handle(StepShape_HArray1OfFace) aFaces = Shell->CfsFaces();
  for (Standard_Integer f = aFaces->Lower(); f <= aFaces->Upper(); ++f)
  {
    const Handle(StepShape_Face)& aFace = aFaces->Value(f);
    if (aFace.IsNull())
      continue;

    // Record CAF data
    SettleShapeData(aFace, RootLab, ShapeTool, TP);

    // Access face bounds
    Handle(StepShape_HArray1OfFaceBound) aWires = aFace->Bounds();
    if (aWires.IsNull())
      continue;
    for (Standard_Integer w = aWires->Lower(); w <= aWires->Upper(); ++w)
    {
      const Handle(StepShape_Loop)& aWire = aWires->Value(w)->Bound();

      // Record CAF data
      SettleShapeData(aWire, RootLab, ShapeTool, TP);

      // Access wire edges
      // Currently only EDGE LOOPs are considered (!)
      if (!aWire->IsInstance(STANDARD_TYPE(StepShape_EdgeLoop)))
        continue;

      // Access edges
      Handle(StepShape_EdgeLoop) anEdgeLoop = Handle(StepShape_EdgeLoop)::DownCast(aWire);
      Handle(StepShape_HArray1OfOrientedEdge) anEdges = anEdgeLoop->EdgeList();
      for (Standard_Integer e = anEdges->Lower(); e <= anEdges->Upper(); ++e)
      {
        Handle(StepShape_OrientedEdge) anOrientedEdge = anEdges->Value(e);
        if (anOrientedEdge.IsNull())
          continue;
        Handle(StepShape_Edge) anEdge = anOrientedEdge->EdgeElement();
        if (anEdge.IsNull())
          continue;

        // Record CAF data
        SettleShapeData(anEdge, RootLab, ShapeTool, TP);

        // Access vertices
        Handle(StepShape_Vertex) aV1 = anEdge->EdgeStart();
        Handle(StepShape_Vertex) aV2 = anEdge->EdgeEnd();

        // Record CAF data
        SettleShapeData(aV1, RootLab, ShapeTool, TP);
        SettleShapeData(aV2, RootLab, ShapeTool, TP);
      }
    }
  }
}

//=======================================================================
//function : SetColorMode
//purpose  : 
//=======================================================================

void STEPCAFControl_Reader::SetColorMode(const Standard_Boolean colormode)
{
  myColorMode = colormode;
}

//=======================================================================
//function : GetColorMode
//purpose  : 
//=======================================================================

Standard_Boolean STEPCAFControl_Reader::GetColorMode() const
{
  return myColorMode;
}

//=======================================================================
//function : SetNameMode
//purpose  : 
//=======================================================================

void STEPCAFControl_Reader::SetNameMode(const Standard_Boolean namemode)
{
  myNameMode = namemode;
}

//=======================================================================
//function : GetNameMode
//purpose  : 
//=======================================================================

Standard_Boolean STEPCAFControl_Reader::GetNameMode() const
{
  return myNameMode;
}

//=======================================================================
//function : SetLayerMode
//purpose  : 
//=======================================================================

void STEPCAFControl_Reader::SetLayerMode(const Standard_Boolean layermode)
{
  myLayerMode = layermode;
}

//=======================================================================
//function : GetLayerMode
//purpose  : 
//=======================================================================

Standard_Boolean STEPCAFControl_Reader::GetLayerMode() const
{
  return myLayerMode;
}

//=======================================================================
//function : SetPropsMode
//purpose  : 
//=======================================================================

void STEPCAFControl_Reader::SetPropsMode(const Standard_Boolean propsmode)
{
  myPropsMode = propsmode;
}

//=======================================================================
//function : GetPropsMode
//purpose  : 
//=======================================================================

Standard_Boolean STEPCAFControl_Reader::GetPropsMode() const
{
  return myPropsMode;
}

//=======================================================================
//function : SetSHUOMode
//purpose  : 
//=======================================================================

void STEPCAFControl_Reader::SetSHUOMode(const Standard_Boolean mode)
{
  mySHUOMode = mode;
}

//=======================================================================
//function : GetSHUOMode
//purpose  : 
//=======================================================================

Standard_Boolean STEPCAFControl_Reader::GetSHUOMode() const
{
  return mySHUOMode;
}

//=======================================================================
//function : SetGDTMode
//purpose  : 
//=======================================================================

void STEPCAFControl_Reader::SetGDTMode(const Standard_Boolean gdtmode)
{
  myGDTMode = gdtmode;
}

//=======================================================================
//function : GetGDTMode
//purpose  : 
//=======================================================================

Standard_Boolean STEPCAFControl_Reader::GetGDTMode() const
{
  return myGDTMode;
}


//=======================================================================
//function : SetMatMode
//purpose  : 
//=======================================================================

void STEPCAFControl_Reader::SetMatMode(const Standard_Boolean matmode)
{
  myMatMode = matmode;
}

//=======================================================================
//function : GetMatMode
//purpose  : 
//=======================================================================

Standard_Boolean STEPCAFControl_Reader::GetMatMode() const
{
  return myMatMode;
}

//=======================================================================
//function : SetViewMode
//purpose  : 
//=======================================================================

void STEPCAFControl_Reader::SetViewMode(const Standard_Boolean viewmode)
{
  myViewMode = viewmode;
}

//=======================================================================
//function : GetViewMode
//purpose  : 
//=======================================================================

Standard_Boolean STEPCAFControl_Reader::GetViewMode() const
{
  return myViewMode;
}