// File:	STEPCAFControl_Writer.cxx
// Created:	Tue Aug 15 17:35:36 2000
// Author:	Andrey BETENEV
//		<abv@doomox.nnov.matra-dtv.fr>
//
// CURRENT LIMITATIONS: 
//
// when val props and names assigned to instance of 
// component in assembly, it is in fact supposed that only one CDSR corresponds
// to such shape. This can be wrong and should be handled more carefully
// (analysis of SDRs which the CDSR links should be done)
//
// Names and validation props are supported for top-level shapes only

#include <STEPCAFControl_Writer.ixx>
#include <STEPControl_StepModelType.hxx>
#include <XCAFDoc_ShapeTool.hxx>
#include <TDF_LabelSequence.hxx>
#include <TopoDS_Shape.hxx>
#include <XCAFPrs_DataMapOfShapeStyle.hxx>
#include <XCAFPrs.hxx>
#include <XCAFPrs_DataMapOfStyleShape.hxx>
#include <XCAFPrs_Style.hxx>
#include <XCAFPrs_DataMapIteratorOfDataMapOfStyleShape.hxx>
#include <TopTools_SequenceOfShape.hxx>
#include <TopoDS_Iterator.hxx>
#include <STEPConstruct_Styles.hxx>
#include <XCAFDoc_ColorTool.hxx>
#include <STEPConstruct.hxx>
#include <TopTools_MapOfShape.hxx>
#include <XSControl_TransferWriter.hxx>
#include <TDataStd_Name.hxx>
#include <StepShape_ShapeDefinitionRepresentation.hxx>
#include <TransferBRep_ShapeMapper.hxx>
#include <TransferBRep.hxx>
#include <StepRepr_PropertyDefinition.hxx>
#include <StepBasic_ProductDefinition.hxx>
#include <StepBasic_Product.hxx>
#include <TCollection_HAsciiString.hxx>
#include <TCollection_AsciiString.hxx>
#include <Transfer_FinderProcess.hxx>
#include <StepBasic_ProductDefinitionFormation.hxx>
#include <XCAFDoc_DocumentTool.hxx>
#include <TDF_Label.hxx>
#include <STEPCAFControl_Controller.hxx>
#include <STEPCAFControl_IteratorOfDictionaryOfExternFile.hxx>
#include <STEPConstruct_ExternRefs.hxx>
#include <Interface_Static.hxx>
#include <TopoDS_Compound.hxx>
#include <BRep_Builder.hxx>
#include <Transfer_ActorOfFinderProcess.hxx>
#include <STEPCAFControl_ActorWrite.hxx>
#include <STEPConstruct_ValidationProps.hxx>
#include <XCAFDoc_Area.hxx>
#include <XCAFDoc_Volume.hxx>
#include <XCAFDoc_Centroid.hxx>
#include <StepShape_ContextDependentShapeRepresentation.hxx>
#include <StepRepr_ProductDefinitionShape.hxx>
#include <StepBasic_ProductDefinitionRelationship.hxx>
#include <XCAFDoc_GraphNode.hxx>
#include <XCAFDoc_LayerTool.hxx>
#include <StepVisual_PresentationLayerAssignment.hxx>
#include <XCAFDoc.hxx>
#include <StepVisual_HArray1OfLayeredItem.hxx>
#include <TColStd_HSequenceOfTransient.hxx>
#include <TDF_Tool.hxx>

#include <Transfer_Binder.hxx>
#include <Transfer_TransientListBinder.hxx>
#include <StepVisual_InvisibleItem.hxx>
#include <TDataStd_UAttribute.hxx>
#include <StepVisual_Invisibility.hxx>
#include <StepVisual_HArray1OfInvisibleItem.hxx>
#include <HeaderSection_FileSchema.hxx>
#include <StepData_StepModel.hxx>
#include <StepAP214_Protocol.hxx>
#include <OSD_Path.hxx>
#include <XSControl_WorkSession.hxx>
#include <StepRepr_HArray1OfRepresentationItem.hxx>
#include <STEPCAFControl_DataMapIteratorOfDataMapOfShapeTransient.hxx>
#include <StepRepr_Representation.hxx>
#include <StepVisual_MechanicalDesignGeometricPresentationRepresentation.hxx>
#include <Quantity_TypeOfColor.hxx>
#include <StepVisual_HArray1OfPresentationStyleAssignment.hxx>
#include <StepVisual_PresentationStyleAssignment.hxx>
#include <StepVisual_StyledItem.hxx>
#include <StepVisual_PresentationStyleByContext.hxx>
#include <StepVisual_HArray1OfPresentationStyleSelect.hxx>
#include <TDF_AttributeSequence.hxx>
#include <TColStd_MapOfTransient.hxx>
// #include <TColStd_IndexedDataMapOfTransientTransient.hxx>
#include <StepRepr_NextAssemblyUsageOccurrence.hxx>
#include <Interface_EntityIterator.hxx>
#include <StepRepr_SpecifiedHigherUsageOccurrence.hxx>

// added by skl 15.01.2004 for D&GT writing
#include <XCAFDoc_DimTolTool.hxx>
#include <XCAFDoc_DimTol.hxx>
#include <XCAFDoc_Datum.hxx>
#include <STEPConstruct_DataMapOfAsciiStringTransient.hxx>
#include <STEPConstruct_DataMapOfPointTransient.hxx>
#include <StepBasic_MeasureValueMember.hxx>
#include <StepBasic_SiUnitAndLengthUnit.hxx>
#include <StepGeom_GeometricRepresentationContextAndGlobalUnitAssignedContext.hxx>
#include <StepGeom_GeomRepContextAndGlobUnitAssCtxAndGlobUncertaintyAssCtx.hxx>
#include <StepBasic_LengthMeasureWithUnit.hxx>
#include <StepShape_EdgeCurve.hxx>
#include <StepShape_AdvancedFace.hxx>
#include <StepShape_OrientedEdge.hxx>
#include <StepShape_EdgeLoop.hxx>
#include <StepShape_FaceBound.hxx>
#include <StepShape_ConnectedFaceSet.hxx>
#include <StepShape_ShapeRepresentation.hxx>
#include <StepShape_DimensionalSize.hxx>
#include <StepShape_ShapeDimensionRepresentation.hxx>
#include <StepShape_DimensionalCharacteristicRepresentation.hxx>
#include <StepRepr_ShapeAspect.hxx>
#include <StepRepr_ShapeAspectRelationship.hxx>
#include <StepRepr_ReprItemAndLengthMeasureWithUnit.hxx>
//#include <StepRepr_CompoundItemDefinition.hxx>
//#include <StepRepr_CompoundItemDefinitionMember.hxx>
#include <StepRepr_ValueRange.hxx>
#include <StepData_Logical.hxx>
#include <StepDimTol_DatumFeature.hxx>
#include <StepDimTol_Datum.hxx>
#include <StepDimTol_DatumReference.hxx>
#include <StepDimTol_HArray1OfDatumReference.hxx>
#include <StepDimTol_GeoTolAndGeoTolWthDatRefAndModGeoTolAndPosTol.hxx>
#include <StepDimTol_ModifiedGeometricTolerance.hxx>
#include <StepDimTol_GeometricToleranceWithDatumReference.hxx>
#include <StepDimTol_AngularityTolerance.hxx>
#include <StepDimTol_CircularRunoutTolerance.hxx>
#include <StepDimTol_CoaxialityTolerance.hxx>
#include <StepDimTol_ConcentricityTolerance.hxx>
#include <StepDimTol_ParallelismTolerance.hxx>
#include <StepDimTol_PerpendicularityTolerance.hxx>
#include <StepDimTol_SymmetryTolerance.hxx>
#include <StepDimTol_TotalRunoutTolerance.hxx>
#include <StepDimTol_CylindricityTolerance.hxx>
#include <StepDimTol_FlatnessTolerance.hxx>
#include <StepDimTol_LineProfileTolerance.hxx>
#include <StepDimTol_PositionTolerance.hxx>
#include <StepDimTol_RoundnessTolerance.hxx>
#include <StepDimTol_StraightnessTolerance.hxx>
#include <StepDimTol_SurfaceProfileTolerance.hxx>
#include <TColStd_HArray1OfReal.hxx>
#include <TColStd_HArray1OfTransient.hxx>

// added by skl 12.02.2004 for writing materials
#include <XCAFDoc_MaterialTool.hxx>
#include <XCAFDoc_Material.hxx>
#include <TDataStd_TreeNode.hxx>
#include <StepRepr_DescriptiveRepresentationItem.hxx>
#include <StepBasic_SiUnitAndMassUnit.hxx>
#include <StepBasic_DerivedUnitElement.hxx>
#include <StepBasic_HArray1OfDerivedUnitElement.hxx>
#include <StepBasic_DerivedUnit.hxx>
#include <StepRepr_MeasureRepresentationItem.hxx>


//=======================================================================
//function : GetLabelName
//purpose  : auxilary function: take name of label and append it to str
//=======================================================================
static Standard_Boolean GetLabelName (const TDF_Label &L, Handle(TCollection_HAsciiString) &str)
{
  Handle(TDataStd_Name) N;
  if ( ! L.FindAttribute ( TDataStd_Name::GetID(), N ) ) return Standard_False;
  TCollection_ExtendedString name = N->Get();
  if ( name.Length() <=0 ) return Standard_False;

  // set name, converting it to Ascii and removing spaces
  TCollection_AsciiString buf ( name, '?' );
  buf.LeftAdjust();
  buf.RightAdjust();
  buf.ChangeAll(' ','_');
  str->AssignCat ( buf.ToCString() );
  return Standard_True;
}


//=======================================================================
//function : STEPCAFControl_Writer
//purpose  :
//=======================================================================

STEPCAFControl_Writer::STEPCAFControl_Writer () :
       myColorMode( Standard_True ),
       myNameMode ( Standard_True ),
       myLayerMode( Standard_True ),
       myPropsMode( Standard_True ),
       mySHUOMode ( Standard_True ),
       myDGTMode  ( Standard_True ),
       myMatMode  ( Standard_True )
{
  STEPCAFControl_Controller::Init();
  Handle(XSControl_WorkSession) WS = new XSControl_WorkSession;
  Init ( WS );
}


//=======================================================================
//function : STEPCAFControl_Writer
//purpose  :
//=======================================================================

STEPCAFControl_Writer::STEPCAFControl_Writer (const Handle(XSControl_WorkSession)& WS,
					      const Standard_Boolean scratch)
{
  STEPCAFControl_Controller::Init();
  Init ( WS, scratch );
  myColorMode = Standard_True;
  myNameMode = Standard_True;
  myLayerMode = Standard_True;
  myPropsMode = Standard_True;
  mySHUOMode = Standard_True;
}


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

void STEPCAFControl_Writer::Init (const Handle(XSControl_WorkSession)& WS,
				  const Standard_Boolean scratch)
{
  WS->SelectNorm ( "STEP" );
  myWriter.SetWS (WS,scratch);
  myFiles = new STEPCAFControl_DictionaryOfExternFile;
  myLabEF.Clear();
  myLabels.Clear();
}


//=======================================================================
//function : Write
//purpose  :
//=======================================================================

IFSelect_ReturnStatus STEPCAFControl_Writer::Write (const Standard_CString filename)
{
  IFSelect_ReturnStatus status = myWriter.Write ( filename );

  // get directory name of the main file
  OSD_Path mainfile ( filename );
  mainfile.SetName ( "" );
  mainfile.SetExtension ( "" );
  TCollection_AsciiString dpath;
  mainfile.SystemName ( dpath );

  STEPCAFControl_IteratorOfDictionaryOfExternFile it ( myFiles );
  for ( ; it.More(); it.Next() ) {
    Handle(STEPCAFControl_ExternFile) EF = it.Value();
    if ( EF->GetWriteStatus() != IFSelect_RetVoid ) continue;

    // construct extern file name
    TCollection_AsciiString fname = OSD_Path::AbsolutePath ( dpath, EF->GetName()->String() );
    if ( fname.Length() <= 0 ) fname = EF->GetName()->String();
#ifdef DEB
    cout << "Writing external file: " << fname.ToCString() << endl;
#endif
    
    EF->SetWriteStatus ( EF->GetWS()->SendAll ( fname.ToCString() ) );
  }

  return status;
}


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

Standard_Boolean STEPCAFControl_Writer::Transfer (const Handle(TDocStd_Document) &doc,
						  const STEPControl_StepModelType mode,
						  const Standard_CString multi)
{
  Handle(XCAFDoc_ShapeTool) STool = XCAFDoc_DocumentTool::ShapeTool( doc->Main() );
  if ( STool.IsNull() ) return Standard_False;

  TDF_LabelSequence labels;
  STool->GetFreeShapes ( labels );
  return Transfer ( myWriter, labels, mode, multi );
}


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

Standard_Boolean STEPCAFControl_Writer::Transfer (const TDF_Label &L,
						  const STEPControl_StepModelType mode,
						  const Standard_CString multi)
{
  TDF_LabelSequence labels;
  labels.Append ( L );
  return Transfer ( myWriter, labels, mode, multi );
}


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

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


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

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


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

const Handle(STEPCAFControl_DictionaryOfExternFile) &STEPCAFControl_Writer::ExternFiles () const
{
  return myFiles;
}


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

Standard_Boolean STEPCAFControl_Writer::ExternFile (const TDF_Label &L,
						    Handle(STEPCAFControl_ExternFile) &ef) const
{
  ef.Nullify();
  if ( ! myLabEF.IsBound ( L ) ) return Standard_False;
  ef = myLabEF.Find ( L );
  return Standard_True;
}


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

Standard_Boolean STEPCAFControl_Writer::ExternFile (const Standard_CString name,
						    Handle(STEPCAFControl_ExternFile) &ef) const
{
  ef.Nullify();
  if ( ! myFiles.IsNull() || ! myFiles->HasItem ( name ) )
    return Standard_False;
  ef = myFiles->Item ( name );
  return Standard_True;
}


//=======================================================================
//function : Writer
//purpose  :
//=======================================================================

STEPControl_Writer &STEPCAFControl_Writer::Writer ()
{
  return myWriter;
}


//=======================================================================
//function : Writer
//purpose  :
//=======================================================================

const STEPControl_Writer &STEPCAFControl_Writer::Writer () const
{
  return myWriter;
}


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

Standard_Boolean STEPCAFControl_Writer::Transfer (STEPControl_Writer &writer,
						  const TDF_LabelSequence &labels,
						  const STEPControl_StepModelType mode,
						  const Standard_CString multi,
                                                  const Standard_Boolean isExternFile)
{
  if ( labels.Length() <=0 ) return Standard_False;

  Handle(STEPCAFControl_ActorWrite) Actor =
    Handle(STEPCAFControl_ActorWrite)::DownCast ( writer.WS()->NormAdaptor()->ActorWrite() );

  // translate free top-level shapes of the DECAF document
#ifdef DEB // includes Transfer_ActorOfFinderProcess
//  cout << "Actor is " << writer.WS()->NormAdaptor()->ActorWrite()->DynamicType()->Name() << endl;
#endif
  Standard_Integer ap = Interface_Static::IVal ("write.step.schema");
  TDF_LabelSequence sublabels;
  for ( Standard_Integer i=1; i <= labels.Length(); i++ ) {
    TDF_Label L = labels.Value(i);
    TopoDS_Shape dummy;
    if ( myLabels.IsBound ( L ) ) continue; // already processed

    TopoDS_Shape shape = XCAFDoc_ShapeTool::GetShape ( L );
    if ( shape.IsNull() ) continue;
    
    // write shape either as a whole, or as multifile (with extern refs)
    if ( ! multi /* || ! XCAFDoc_ShapeTool::IsAssembly ( L ) */ ) {
      Actor->SetStdMode ( Standard_False );

      // fill sequence of (sub) shapes for which attributes should be written
      // and set actor to handle assemblies in a proper way
      TDF_LabelSequence comp;
      XCAFDoc_ShapeTool::GetComponents ( L, comp, Standard_True );
      for ( Standard_Integer k=1; k <= comp.Length(); k++ ) {
	TDF_Label ref;
	if ( ! XCAFDoc_ShapeTool::GetReferredShape ( comp(k), ref ) ) continue;
	if ( ! myLabels.IsBound ( ref ) ) {
	  TopoDS_Shape refS = XCAFDoc_ShapeTool::GetShape ( ref );
	  myLabels.Bind ( ref, refS );
	  sublabels.Append ( ref );
	  if ( XCAFDoc_ShapeTool::IsAssembly ( ref ) )
	    Actor->RegisterAssembly ( refS );
	}
      }
      myLabels.Bind ( L, shape );
      sublabels.Append ( L );
      if ( XCAFDoc_ShapeTool::IsAssembly ( L ) )
	Actor->RegisterAssembly ( shape );

      writer.Transfer(shape,mode,Standard_False);
      Actor->SetStdMode ( Standard_True ); // restore default behaviour
    }
    else {
      // translate final solids
      TopoDS_Shape Sass = TransferExternFiles ( L, mode, sublabels, multi );

      // translate main assembly structure
/*
      if ( ap == 3 ) { // if AP203, switch to AP214
	Interface_Static::SetCVal ("write.step.schema", "AP214DIS");
	Handle(StepData_StepModel) model = 
	  Handle(StepData_StepModel)::DownCast ( writer.WS()->Model() );
	if ( model->HasHeaderEntity(STANDARD_TYPE(HeaderSection_FileSchema)) ) {
	  Handle(HeaderSection_FileSchema) fs = 
	    Handle(HeaderSection_FileSchema)::DownCast ( model->HeaderEntity(STANDARD_TYPE(HeaderSection_FileSchema)) );
	  Handle(TCollection_HAsciiString) str = fs->SchemaIdentifiersValue ( 1 );
	  Handle(TCollection_HAsciiString) ap214 = new TCollection_HAsciiString ( "AUTOMOTIVE_DESIGN" );
	  if ( str->Search ( ap214 ) <0 ) {
	    str->Clear();
	    str->AssignCat ( ap214 );
	  }
	}
      }
*/      
      Standard_Integer assemblymode = Interface_Static::IVal ("write.step.assembly");
      Interface_Static::SetCVal ("write.step.assembly", "On");
      writer.Transfer ( Sass, STEPControl_AsIs );
      Interface_Static::SetIVal ("write.step.assembly", assemblymode);
      Interface_Static::SetIVal ("write.step.schema", ap);
    }
  }

  writer.WS()->ComputeGraph(Standard_True );// added by skl 03.11.2003 since we use
                                            // writer.Transfer() wihtout compute graph

  // write names
  if ( GetNameMode() )
    WriteNames ( writer.WS(), sublabels );

  if ( !multi ) {
    // write colors
    if ( GetColorMode() )
      WriteColors ( writer.WS(), sublabels );
    
    // write layers
    if ( GetLayerMode() )
      WriteLayers ( writer.WS(), sublabels );

    // write SHUO entities
    if ( GetSHUOMode() && !isExternFile ) 
      // do not store SHUO for extern reference for the moment
      WriteSHUOs (  writer.WS(), sublabels );
    
    // write G&DTs
    if(GetDimTolMode())
      WriteDGTs(writer.WS(),sublabels);

    // write Materials
    if(GetMaterialMode())
      WriteMaterials(writer.WS(),sublabels);

    // register all MDGPRs in model
    STEPCAFControl_DataMapIteratorOfDataMapOfShapeTransient anItr(myMapCompMDGPR);
    for (; anItr.More(); anItr.Next()) {
      Handle(Interface_InterfaceModel) Model = writer.WS()->Model();
      Model->AddWithRefs( anItr.Value() );
    }
  }
  
  if ( multi ) { // external refs
    WriteExternRefs ( writer.WS(), sublabels );
  }

  // write validation props
//  if ( multi && ap ==3 ) {
//      Interface_Static::SetCVal ("write.step.schema", "AP214DIS");
//  }
  if ( GetPropsMode() ) 
    WriteValProps ( writer.WS(), sublabels, multi );

  Interface_Static::SetIVal ("write.step.schema", ap);

  // refresh graph
  writer.WS()->ComputeGraph ( Standard_True );

  return Standard_True;
}


//=======================================================================
//function : TransferExternFiles
//purpose  :
//=======================================================================

TopoDS_Shape STEPCAFControl_Writer::TransferExternFiles (const TDF_Label &L,
							 const STEPControl_StepModelType mode,
							 TDF_LabelSequence &labels,
							 const Standard_CString prefix)
{
  // if label already translated, just return the shape
  if ( myLabels.IsBound ( L ) ) {
    return myLabels.Find ( L );
  }

  TopoDS_Compound C;
  BRep_Builder B;
  B.MakeCompound ( C );
  labels.Append ( L );

  // if not assembly, write to separate file
  if ( ! XCAFDoc_ShapeTool::IsAssembly ( L ) ) {

    // prepare for transfer
    Handle(XSControl_WorkSession) newWS = new XSControl_WorkSession;
    newWS->SelectNorm ( "STEP" );
    STEPControl_Writer sw ( newWS, Standard_True );
    TDF_LabelSequence Lseq;
    Lseq.Append ( L );

    // construct the name for extern file
    Handle(TCollection_HAsciiString) basename = new TCollection_HAsciiString;
    if ( prefix && prefix[0] ) basename->AssignCat ( prefix );
    GetLabelName ( L, basename );
    Handle(TCollection_HAsciiString) name = new TCollection_HAsciiString ( basename );
    name->AssignCat ( ".stp" );
    if ( myFiles->HasItem ( name->ToCString() ) ) { // avoid confusions
      for ( Standard_Integer k=1; k < 32000; k++ ) {
	name = new TCollection_HAsciiString ( basename );
	name->AssignCat ( "_" );
	name->AssignCat ( TCollection_AsciiString ( k ).ToCString() );
	name->AssignCat ( ".stp" );
	if ( ! myFiles->HasItem ( name->ToCString() ) ) break;
      }
    }

    // translate and record extern file
    Handle(STEPCAFControl_ExternFile) EF = new STEPCAFControl_ExternFile;
    EF->SetWS ( newWS );
    EF->SetName ( name );
    EF->SetLabel ( L );
    Standard_Integer assemblymode = Interface_Static::IVal ("write.step.assembly");
    Interface_Static::SetCVal ("write.step.assembly", "Off");
    const Standard_CString multi = 0;
    EF->SetTransferStatus ( Transfer ( sw, Lseq, mode, multi, Standard_True ) );
    Interface_Static::SetIVal ("write.step.assembly", assemblymode);
    myLabEF.Bind ( L, EF );
    myFiles->SetItem ( name->ToCString(), EF );

    // return empty compound as replacement for the shape
    myLabels.Bind ( L, C );
    return C;
  }

  // else iterate on components add create structure of empty compounds
  // representing the assembly
  TDF_LabelSequence comp;
  XCAFDoc_ShapeTool::GetComponents ( L, comp, Standard_False );
  for ( Standard_Integer k=1; k <= comp.Length(); k++ ) {
    TDF_Label lab = comp(k);
    TDF_Label ref;
    if ( ! XCAFDoc_ShapeTool::GetReferredShape ( lab, ref ) ) continue;
    TopoDS_Shape Scomp = TransferExternFiles ( ref, mode, labels, prefix );
    Scomp.Location ( XCAFDoc_ShapeTool::GetLocation ( lab ) );
    B.Add ( C, Scomp );
  }
  myLabels.Bind ( L, C );
  return C;
}


//=======================================================================
//function : WriteExternRefs
//purpose  :
//=======================================================================

Standard_Boolean STEPCAFControl_Writer::WriteExternRefs (const Handle(XSControl_WorkSession) &WS,
							 const TDF_LabelSequence &labels) const
{
  if ( labels.Length() <=0 ) return Standard_False;

  Handle(XSControl_TransferWriter) TW = WS->TransferWriter();
  Handle(Transfer_FinderProcess) FP = TW->FinderProcess();
  STEPConstruct_ExternRefs EFTool ( WS );
  Standard_Integer schema = Interface_Static::IVal("write.step.schema");
  for ( Standard_Integer k=1; k <= labels.Length(); k++ ) {
    TDF_Label lab = labels(k);
    if ( XCAFDoc_ShapeTool::IsAssembly ( lab ) ) continue; // skip assemblies

    // get extern file
    Handle(STEPCAFControl_ExternFile) EF;
    if ( ! ExternFile ( lab, EF ) ) continue; // should never be

    // find SDR
    if ( ! myLabels.IsBound ( lab ) ) continue; // not recorded as translated, skip
    TopoDS_Shape S = myLabels.Find ( lab );

    Handle(StepShape_ShapeDefinitionRepresentation) SDR;
    Handle(TransferBRep_ShapeMapper) mapper = TransferBRep::ShapeMapper ( FP, S );
    if ( ! FP->FindTypedTransient ( mapper, STANDARD_TYPE(StepShape_ShapeDefinitionRepresentation), SDR ) ) {
#ifdef DEB
      cout << "Warning: Cannot find SDR for " << S.TShape()->DynamicType()->Name() << endl;
#endif
      continue;
    }

    // add extern ref
    const Standard_CString format = (const Standard_CString) ( schema == 3 ? "STEP AP203" : "STEP AP214" );
    // try to get PD from SDR
    StepRepr_RepresentedDefinition RD = SDR->Definition();
    Handle(StepRepr_PropertyDefinition) aPropDef = RD.PropertyDefinition();
    if (aPropDef.IsNull()) {
#ifdef DEB
      cout << "Warning: STEPCAFControl_Writer::WriteExternRefs StepRepr_PropertyDefinition is null for " << S.TShape()->DynamicType()->Name() << endl;
#endif
      continue;
    }
    StepRepr_CharacterizedDefinition CharDef = aPropDef->Definition();
    Handle(StepBasic_ProductDefinition) PD = CharDef.ProductDefinition();
    if (PD.IsNull()) {
#ifdef DEB
      cout << "Warning: STEPCAFControl_Writer::WriteExternRefs StepBasic_ProductDefinition is null for " << S.TShape()->DynamicType()->Name() << endl;
#endif
      continue;
    }
    EFTool.AddExternRef ( EF->GetName()->ToCString(), PD, format );
  }
  EFTool.WriteExternRefs(schema);
  return Standard_True;
}


//=======================================================================
//function : FindEntities
//purpose  : auxilary
//=======================================================================
static Standard_Integer FindEntities (const Handle(Transfer_FinderProcess) &FP,
				      const TopoDS_Shape &S,
				      TopLoc_Location &L,
				      TColStd_SequenceOfTransient &seqRI)
{
  Handle(StepRepr_RepresentationItem) item = STEPConstruct::FindEntity ( FP, S, L );

  if ( ! item.IsNull() ) {
    seqRI.Append ( item );
    return 1;
  }
      
  // may be S was splited during shape processing
  Handle(TransferBRep_ShapeMapper) mapper = TransferBRep::ShapeMapper ( FP, S );
  Handle(Transfer_Binder) bnd = FP->Find ( mapper );
  if ( bnd.IsNull() ) return 0;
  
  Handle(Transfer_TransientListBinder) TransientListBinder =
    //Handle(Transfer_TransientListBinder)::DownCast( bnd->Next(Standard_True) );
    Handle(Transfer_TransientListBinder)::DownCast( bnd );
  if ( TransientListBinder.IsNull() ) return 0;

  Standard_Integer nb = TransientListBinder->NbTransients(), nres=0;
  for (Standard_Integer i=1; i<=nb; i++) {
    Handle(Standard_Transient) t = TransientListBinder->Transient(i);
    item = Handle(StepRepr_RepresentationItem)::DownCast(t);
    if ( item.IsNull() ) continue;
    nres++;
    seqRI.Append ( item );
  }
/*  works but is obsolete: another approach
  if (i<=nb) {
    TopoDS_Shape comp = TransferBRep::ShapeResult(bnd);
    if ( ! comp.IsNull() && comp.ShapeType() < S.ShapeType() ) {
      for ( TopoDS_Iterator it(comp); it.More(); it.Next() ) {
        MakeSTEPStyles(Styles, it.Value(), settings, STEPstyle, 
		       Map, ( hasOwn ? &style : 0 ) );
      }
    }
  }
*/
  return nres;
}


//=======================================================================
//function : getStyledItem
//purpose  : auxilary
//=======================================================================
static Standard_Boolean getStyledItem(const TopoDS_Shape& S,
                                      const Handle(XCAFDoc_ShapeTool)& STool,
                                      const STEPConstruct_Styles &Styles, 
                                      Handle(StepVisual_StyledItem) &resSelItem,
                                      const STEPCAFControl_DataMapOfShapeTransient& myMapCompMDGPR)
{
  TDF_Label aTopShL = STool->FindShape(S, Standard_False);
  TopoDS_Shape aTopLevSh = STool->GetShape( aTopShL );
  Standard_Boolean found = Standard_False;
  if ( !aTopLevSh.IsNull() &&  myMapCompMDGPR.IsBound( aTopLevSh ) ) {
    Handle(StepVisual_PresentationRepresentation) aMDGPR = 
      Handle(StepVisual_PresentationRepresentation)::DownCast( myMapCompMDGPR.Find( aTopLevSh ) );
    Handle(StepRepr_HArray1OfRepresentationItem) anSelItmHArr = aMDGPR->Items();
    // search for PSA of Monifold solid
    if ( !anSelItmHArr.IsNull() )
      for (Standard_Integer si = 1; si <= anSelItmHArr->Length(); si++) {
        Handle(StepVisual_StyledItem) aSelItm =
          Handle(StepVisual_StyledItem)::DownCast(anSelItmHArr->Value(si));
        if ( !aSelItm.IsNull() ) {
          // check that it is a stiled item for monifold solid brep
          TopLoc_Location Loc;
          TColStd_SequenceOfTransient aNewseqRI;
          FindEntities ( Styles.FinderProcess(), aTopLevSh, Loc, aNewseqRI );
          if ( aNewseqRI.Length() <= 0 )
            continue;
          Handle(StepRepr_RepresentationItem) anItem = aSelItm->Item();
          Standard_Boolean isSameMonSolBR = Standard_False;
          for (Standard_Integer mi = 1; mi <= aNewseqRI.Length(); mi++) {
            if ( !anItem.IsNull() && anItem == aNewseqRI.Value( mi ) ) {
              isSameMonSolBR = Standard_True;
              break;
            }
          }
          if (!isSameMonSolBR)
            continue;
        }
        else
          continue;
        
        for (Standard_Integer jsi = 1; jsi <= aSelItm->NbStyles() && !found; jsi++) {
          Handle(StepVisual_PresentationStyleAssignment) aFatherPSA =
            Handle(StepVisual_PresentationStyleAssignment)::DownCast(aSelItm->StylesValue(jsi));
          // check for PSA for top-level (not Presentation style by contex for NAUO)
          if (aFatherPSA.IsNull() || aFatherPSA->IsKind(STANDARD_TYPE(StepVisual_PresentationStyleByContext)))
            continue;
          resSelItem = aSelItm;
          found = Standard_True;
        }
      }
  }
  return found;
}


//=======================================================================
//function : setDefaultInstanceColor
//purpose  : auxilary
//=======================================================================
static Standard_Boolean setDefaultInstanceColor (const Handle(StepVisual_StyledItem) &aSelItm,
                                                 Handle(StepVisual_PresentationStyleAssignment)& PSA)
{
   Standard_Boolean found = Standard_False;
  for (Standard_Integer jsi = 1; jsi <= aSelItm->NbStyles() && !found; jsi++) {
    Handle(StepVisual_PresentationStyleAssignment) aFatherPSA =
    Handle(StepVisual_PresentationStyleAssignment)::DownCast(aSelItm->StylesValue(jsi));
  // check for PSA for top-level (not Presentation style by contex for NAUO)
  if (aFatherPSA.IsNull() || aFatherPSA->IsKind(STANDARD_TYPE(StepVisual_PresentationStyleByContext))) 
    return Standard_False;
          
  // get style select from father PSA
  if (aFatherPSA->NbStyles() > 0) {
    Handle(StepVisual_HArray1OfPresentationStyleSelect) aFatherStyles =
      new StepVisual_HArray1OfPresentationStyleSelect(1, aFatherPSA->NbStyles());
    for (Standard_Integer k = 1; k <= aFatherPSA->NbStyles(); k++) {
      StepVisual_PresentationStyleSelect PSS;
      StepVisual_PresentationStyleSelect olDPSS = aFatherPSA->StylesValue(k);
      if (!olDPSS.PointStyle().IsNull())
        PSS.SetValue (olDPSS.PointStyle());
      else if (!olDPSS.CurveStyle().IsNull())
        PSS.SetValue (olDPSS.CurveStyle());
      else if (!olDPSS.SurfaceStyleUsage().IsNull())
        PSS.SetValue (olDPSS.SurfaceStyleUsage());
      else {
        found = Standard_False;
        break;
      }
      //aFatherStyles->SetValue( k, PSS );
      aFatherStyles->SetValue( k, olDPSS );
      found = Standard_True;
    }
            // init PSA of NAUO
    if (found) {
      PSA->Init( aFatherStyles );
    }
  }
    
  }
  return found;
}


//=======================================================================
//function : MakeSTEPStyles
//purpose  : auxilary
//=======================================================================
static void MakeSTEPStyles (STEPConstruct_Styles &Styles,
			    const TopoDS_Shape &S,
			    const XCAFPrs_DataMapOfShapeStyle &settings,
			    Handle(StepVisual_StyledItem) &override,
			    TopTools_MapOfShape &Map,
                            const STEPCAFControl_DataMapOfShapeTransient& myMapCompMDGPR,
                            STEPConstruct_DataMapOfAsciiStringTransient &DPDCs,
                            STEPConstruct_DataMapOfPointTransient &ColRGBs,
                            const Handle(XCAFDoc_ColorTool)& CTool,
			    const XCAFPrs_Style *inherit = 0,
                            const Standard_Boolean isComponent = Standard_False)
{
  // skip already processed shapes
  if ( ! Map.Add ( S ) ) return;

  // check if shape has its own style (r inherits from ancestor)
  XCAFPrs_Style style;
  if ( inherit ) style = *inherit;
  if ( settings.IsBound(S) ) {
    XCAFPrs_Style own = settings.Find(S);
    if ( !own.IsVisible() ) style.SetVisibility ( Standard_False );
    if ( own.IsSetColorCurv() ) style.SetColorCurv ( own.GetColorCurv() );
    if ( own.IsSetColorSurf() ) style.SetColorSurf ( own.GetColorSurf() );
  }

  // translate colors to STEP
  Handle(StepVisual_Colour) surfColor, curvColor;
  if ( style.IsSetColorSurf() )
    surfColor = Styles.EncodeColor(style.GetColorSurf(),DPDCs,ColRGBs);
  if ( style.IsSetColorCurv() )
    curvColor = Styles.EncodeColor(style.GetColorCurv(),DPDCs,ColRGBs);
  
  Standard_Boolean hasOwn = ( ! surfColor.IsNull() || 
                              ! curvColor.IsNull() ||
                              ! style.IsVisible() );

  // find target item and assign style to it
  Handle(StepVisual_StyledItem) STEPstyle = override;
  if ( hasOwn ) {
    if ( S.ShapeType() != TopAbs_COMPOUND || isComponent ) { // skip compounds, let subshapes inherit its colors
      TopLoc_Location L;
      TColStd_SequenceOfTransient seqRI;
      Standard_Integer nb = FindEntities ( Styles.FinderProcess(), S, L, seqRI );
      
#ifdef DEB
      if ( nb <=0 ) cout << "Warning: Cannot find RI for " << S.TShape()->DynamicType()->Name() << endl;
#endif
      //Get overridden style gka 10.06.03
      if ( nb && isComponent ) 
            getStyledItem(S, CTool->ShapeTool(), Styles, override,myMapCompMDGPR);
      
      for ( Standard_Integer i=1; i <= nb; i++ ) {
	Handle(StepRepr_RepresentationItem) item = 
	  Handle(StepRepr_RepresentationItem)::DownCast(seqRI(i));
	Handle(StepVisual_PresentationStyleAssignment) PSA;
        if ( style.IsVisible() || !surfColor.IsNull() || !curvColor.IsNull() ) {
          PSA = Styles.MakeColorPSA ( item, surfColor, curvColor, isComponent );
        }
        else {
          // default white color
          surfColor = Styles.EncodeColor(Quantity_Color(1,1,1,Quantity_TOC_RGB),DPDCs,ColRGBs);
          PSA = Styles.MakeColorPSA ( item, surfColor, curvColor, isComponent );
          if ( isComponent ) 
            setDefaultInstanceColor( override, PSA);
           
          } // end of component case
        
	STEPstyle = Styles.AddStyle ( item, PSA, override );
	hasOwn = Standard_False;
      }
    }
  }

  // iterate on subshapes (except vertices :)
  if ( S.ShapeType() == TopAbs_EDGE ) return;
  if ( !isComponent ) // PTV 10.02.2003
    for ( TopoDS_Iterator it(S); it.More(); it.Next() ) {
      MakeSTEPStyles ( Styles, it.Value(), settings, STEPstyle,
                      Map, myMapCompMDGPR, DPDCs, ColRGBs, CTool,
                      ( hasOwn ? &style : 0 ) );
    }
}

/*
static Standard_Boolean getFatherColor (const TDF_Label& L,
                                        const Handle(XCAFDoc_ColorTool)& CTool,
                                        XCAFPrs_Style& style)
{
  Standard_Boolean done = Standard_False;
  TopoDS_Shape aSh = CTool->ShapeTool()->GetShape( L );
  TDF_Label aFL = CTool->ShapeTool()->FindShape( aSh );
  if (aFL.IsNull() || aFL == L)
    return done;
  Quantity_Color C;
  if ( CTool->GetColor ( aFL, XCAFDoc_ColorGen, C ) ) {
    style.SetColorCurv ( C );
    style.SetColorSurf ( C );
    done = Standard_True;
  }
  if ( CTool->GetColor ( aFL, XCAFDoc_ColorSurf, C ) ) {
    style.SetColorSurf ( C );
    done = Standard_True;
  }
  if ( CTool->GetColor ( aFL, XCAFDoc_ColorCurv, C ) ) {
    style.SetColorCurv ( C );
    done = Standard_True;
  }
  
  return done;
}
*/


//=======================================================================
//function : WriteColors
//purpose  : 
//=======================================================================

Standard_Boolean STEPCAFControl_Writer::WriteColors (const Handle(XSControl_WorkSession) &WS,
						     const TDF_LabelSequence &labels)
{
  if ( labels.Length() <=0 ) return Standard_False;

  // Iterate on shapes in the document
  Handle(XCAFDoc_ColorTool) CTool = XCAFDoc_DocumentTool::ColorTool( labels(1) );
  if ( CTool.IsNull() ) return Standard_False;

  STEPConstruct_Styles Styles ( WS );
  STEPConstruct_DataMapOfAsciiStringTransient DPDCs;
  STEPConstruct_DataMapOfPointTransient ColRGBs;
  for ( Standard_Integer i=1; i <= labels.Length(); i++ ) {
    TDF_Label L = labels.Value(i);

    Handle(XCAFDoc_ShapeTool) aSTool = XCAFDoc_DocumentTool::ShapeTool( labels(1) );
    // Skip assemblies: colors assigned to assemblies and their instances
    // are not supported (it is not clear how to encode that in STEP)
    if ( XCAFDoc_ShapeTool::IsAssembly ( L ) ) {
#ifdef DEB
      cout << "Warning: Cannot write color  for Assembly" << endl;
      cout << "Info: Check for colors assigned to components in assembly" << endl;
#endif
      // PTV 22.01.2003 Write color for instances.
      TDF_LabelSequence compLabels;
      if ( aSTool.IsNull() )
        continue;
      if (!aSTool->GetComponents(L, compLabels))
        continue;
      WriteColors(WS, compLabels);
      continue;
    }
    Styles.ClearStyles();

    // get a target shape and try to find corresponding context
    // (all the colors set under that label will be put into that context)
    TopoDS_Shape S;
    if ( ! XCAFDoc_ShapeTool::GetShape ( L, S ) ) continue;
    Standard_Boolean isComponent = aSTool->IsComponent( L );
    TopoDS_Shape aTopSh = S;
    Handle(StepRepr_RepresentationContext) Context = Styles.FindContext ( S );
    if ( isComponent ) {
      TDF_Label aTopShL = aSTool->FindShape(S, Standard_False);
      if (aTopShL.IsNull())
        continue;
      aTopSh = aSTool->GetShape( aTopShL );
      Context = Styles.FindContext ( aTopSh );
    }
    if ( Context.IsNull() )
        continue;
    
    // collect settings set on that label
    XCAFPrs_DataMapOfShapeStyle settings;
    TDF_LabelSequence seq;
    seq.Append ( L );
    XCAFDoc_ShapeTool::GetSubShapes ( L, seq );
    Standard_Boolean isVisible = Standard_True;
    for ( Standard_Integer j = 1; j <= seq.Length(); j++ ) {
      TDF_Label lab = seq.Value(j);
      XCAFPrs_Style style;
      Quantity_Color C;
      if ( isComponent && lab == L ) {
        // check for invisible status of object on label
        if ( !CTool->IsVisible( lab ) ) {
          isVisible = Standard_False;
          style.SetVisibility( Standard_False );
        }
      }
      if ( CTool->GetColor ( lab, XCAFDoc_ColorGen, C ) ) {
	style.SetColorCurv ( C );
	style.SetColorSurf ( C );
      }
      if ( CTool->GetColor ( lab, XCAFDoc_ColorSurf, C ) )
	style.SetColorSurf ( C );
      if ( CTool->GetColor ( lab, XCAFDoc_ColorCurv, C ) )
	style.SetColorCurv ( C );
      // commented, cause we are need to take reference from 
//       if ( isComponent && lab == L && !isVisible)
//         if ( !style.IsSetColorSurf() && !style.IsSetColorCurv() ) {
//           getFatherColor ( L, CTool, style);
//         }
      if ( ! style.IsSetColorCurv() && ! style.IsSetColorSurf() && isVisible ) continue;

      TopoDS_Shape sub = XCAFDoc_ShapeTool::GetShape ( lab );
      settings.Bind ( sub, style );
    }
    
    if ( settings.Extent() <=0 ) continue;

    // iterate on subshapes and create STEP styles
    Handle(StepVisual_StyledItem) override;
    TopTools_MapOfShape Map;
    
    MakeSTEPStyles(Styles,S,settings,override,Map,myMapCompMDGPR,DPDCs,ColRGBs,CTool,0,isComponent);
    
    // create MDGPR and record it in model
    Handle(StepVisual_MechanicalDesignGeometricPresentationRepresentation) aMDGPR;

    if (!isComponent) {
      if ( myMapCompMDGPR.IsBound( aTopSh )) {
#ifdef DEB
        cerr << "Error: Current Top-Level shape have MDGPR already " << endl;
#endif
      }
      Styles.CreateMDGPR ( Context, aMDGPR );
      if (!aMDGPR.IsNull())
        myMapCompMDGPR.Bind( aTopSh, aMDGPR );
    }
    else {
      // create SDR and add to model.
      Handle(XSControl_TransferWriter) TW = WS->TransferWriter();
      Handle(Transfer_FinderProcess) FP = TW->FinderProcess();
      Handle(TransferBRep_ShapeMapper) mapper = TransferBRep::ShapeMapper ( FP, S );
      Handle(StepShape_ContextDependentShapeRepresentation) CDSR;
      if ( FP->FindTypedTransient(mapper, 
                                  STANDARD_TYPE(StepShape_ContextDependentShapeRepresentation),
                                  CDSR) ) {
        // create SDR for NAUO
        Handle(StepRepr_ProductDefinitionShape) nullPDS; // important to be NULL
        Styles.CreateNAUOSRD( Context, CDSR, nullPDS );
        
        // search for MDGPR of the component top-level shape
        if ( myMapCompMDGPR.IsBound( aTopSh )) {
          aMDGPR = Handle(StepVisual_MechanicalDesignGeometricPresentationRepresentation)::DownCast( myMapCompMDGPR.Find( aTopSh ) );
        } else {
          aMDGPR = new StepVisual_MechanicalDesignGeometricPresentationRepresentation;
          Handle(TCollection_HAsciiString) ReprName = new TCollection_HAsciiString ( "" );
          aMDGPR->SetName( ReprName );
          aMDGPR->SetContextOfItems( Context );
          myMapCompMDGPR.Bind ( aTopSh, aMDGPR );
        }
        Handle(StepRepr_HArray1OfRepresentationItem) oldItems = aMDGPR->Items();
        Standard_Integer oldLengthlen = 0;
        if (!oldItems.IsNull())
          oldLengthlen = oldItems->Length();
        Handle(StepRepr_HArray1OfRepresentationItem) newItems =
          new StepRepr_HArray1OfRepresentationItem(1, oldLengthlen + Styles.NbStyles());
        Standard_Integer si;
        Standard_Integer el = 1;
        for ( si=1; si <= oldLengthlen; si++ )
          newItems->SetValue( el++, oldItems->Value( si ) );
        for ( si=1; si <= Styles.NbStyles(); si++ ) {
          newItems->SetValue( el++, Handle(StepRepr_RepresentationItem)::DownCast(Styles.Style(si)));
//           WP->Model()->AddWithRefs ( Handle(StepRepr_RepresentationItem)::DownCast (Styles.Style(si)));
        }
        if ( !isVisible ) {
          // create invisibility item and refer for stiledItem
          Handle(StepVisual_Invisibility) Invsblt = new StepVisual_Invisibility();
          Handle(StepVisual_HArray1OfInvisibleItem) HInvsblItm = 
            new StepVisual_HArray1OfInvisibleItem (1,Styles.NbStyles());
          // put all style item into the harray
          for ( si=1; si <= Styles.NbStyles(); si++ ) {
            Handle(StepRepr_RepresentationItem) styledItm =
              Handle(StepRepr_RepresentationItem)::DownCast(Styles.Style(si));
            StepVisual_InvisibleItem anInvItem;
            anInvItem.SetValue( styledItm );
            HInvsblItm->SetValue( si, anInvItem );
          }
          // set the invisibility of items
          Invsblt->Init( HInvsblItm );
          WS->Model()->AddWithRefs( Invsblt );
        }
        
        if (newItems->Length() > 0)
          aMDGPR->SetItems( newItems );
      } //end of work with CDSR
    }
  }

  return Standard_True;
}


//=======================================================================
//function : WriteNames
//purpose  :
//=======================================================================

Standard_Boolean STEPCAFControl_Writer::WriteNames (const Handle(XSControl_WorkSession) &WS,
						    const TDF_LabelSequence &labels) const
{
  if ( labels.Length() <=0 ) return Standard_False;

  // get working data
  Handle(Interface_InterfaceModel) Model = WS->Model();
  Handle(XSControl_TransferWriter) TW = WS->TransferWriter();
  Handle(Transfer_FinderProcess) FP = TW->FinderProcess();
//  Handle(XCAFDoc_ShapeTool) STool = XCAFDoc_DocumentTool::ShapeTool( labels(1) );
//  if ( STool.IsNull() ) return Standard_False;

  // Iterate on requested shapes
  for ( Standard_Integer i=1; i <= labels.Length(); i++ ) {
    TDF_Label L = labels.Value(i);

    // get name
    Handle(TCollection_HAsciiString) hName = new TCollection_HAsciiString;
    if ( ! GetLabelName (L, hName) ) continue;
//    Handle(TDataStd_Name) N;
//    if ( ! L.FindAttribute ( TDataStd_Name::GetID(), N ) ) continue;
//    TCollection_ExtendedString name = N->Get();
//    if ( name.Length() <=0 ) continue;

    // find target STEP entity for the current shape
//    TopoDS_Shape S;
//    if ( ! XCAFDoc_ShapeTool::GetShape ( L, S ) ) continue;
    if ( ! myLabels.IsBound ( L ) ) continue; // not recorded as translated, skip
    TopoDS_Shape S = myLabels.Find ( L );

    Handle(StepShape_ShapeDefinitionRepresentation) SDR;
    Handle(TransferBRep_ShapeMapper) mapper = TransferBRep::ShapeMapper ( FP, S );
    if ( ! FP->FindTypedTransient ( mapper, STANDARD_TYPE(StepShape_ShapeDefinitionRepresentation), SDR ) ) {
#ifdef DEB
      cout << "Warning: Cannot find SDR for " << S.TShape()->DynamicType()->Name() << endl;
#endif
      continue;
    }

    // set the name to the PRODUCT
    Handle(StepRepr_PropertyDefinition) PropD = SDR->Definition().PropertyDefinition();
    if ( PropD.IsNull() ) continue;
    Handle(StepBasic_ProductDefinition) PD = PropD->Definition().ProductDefinition();
    if ( PD.IsNull() ) continue;
    Handle(StepBasic_Product) Prod = PD->Formation()->OfProduct();

    Prod->SetId ( hName );
    Prod->SetName ( hName );

    // write names for components of assemblies
    if ( XCAFDoc_ShapeTool::IsAssembly ( L ) ) {
      TDF_LabelSequence seq;
      XCAFDoc_ShapeTool::GetComponents ( L, seq );
      for (Standard_Integer k=1; k <= seq.Length(); k++) {
	TDF_Label lab = seq(k);

	// get shape with correct location
	TDF_Label Lref;
	if ( ! XCAFDoc_ShapeTool::GetReferredShape ( lab, Lref ) || 
	     ! myLabels.IsBound ( Lref ) ) continue;
	S = myLabels.Find ( Lref );
	S.Move ( XCAFDoc_ShapeTool::GetLocation ( lab ) );
	
	hName = new TCollection_HAsciiString;
	if ( ! GetLabelName (lab, hName) ) continue;
	
	// find the target CDSR corresponding to a shape
	mapper = TransferBRep::ShapeMapper ( FP, S );
	Handle(Transfer_Binder) binder = FP->Find ( mapper );
	Handle(StepShape_ContextDependentShapeRepresentation) CDSR;
	if ( ! FP->FindTypedTransient (mapper,STANDARD_TYPE(StepShape_ContextDependentShapeRepresentation), CDSR) ) 
	  continue;
	Handle(StepRepr_ProductDefinitionShape) PDS = CDSR->RepresentedProductRelation();
	Handle(StepBasic_ProductDefinitionRelationship) NAUO = PDS->Definition().ProductDefinitionRelationship();
	if ( ! NAUO.IsNull() ) NAUO->SetName ( hName );
      }
    }
  }

  return Standard_True;
}


//=======================================================================
//function : WritePropsForLabel
//purpose  :
//=======================================================================
static Standard_Boolean WritePropsForLabel(const Handle(XSControl_WorkSession) &WS,
                                           const Handle(XCAFDoc_ShapeTool) &aSTool,
                                           const STEPCAFControl_DataMapOfLabelShape &myLabels,
                                           const TDF_Label &L,
                                           const Standard_CString multi)
{
  if(L.IsNull()) return Standard_False;

  STEPConstruct_ValidationProps Props ( WS );

  TopoDS_Shape S = aSTool->GetShape(L);
  if(S.IsNull()) return Standard_False;

  if ( ! multi || XCAFDoc_ShapeTool::IsAssembly ( L ) ) {
    // write area
    Handle(XCAFDoc_Area) A;
    L.FindAttribute ( XCAFDoc_Area::GetID(), A );
    if ( ! A.IsNull() ) {
      Props.AddArea ( S, A->Get() );
    }
    // write volume
    Handle(XCAFDoc_Volume) V;
    L.FindAttribute ( XCAFDoc_Volume::GetID(), V );
    if ( ! V.IsNull() ) {
      Props.AddVolume ( S, V->Get() );
    }
  }
  // write centroid
  Handle(XCAFDoc_Centroid) C;
  L.FindAttribute ( XCAFDoc_Centroid::GetID(), C );
  if ( ! C.IsNull() ) {
    Props.AddCentroid ( S, C->Get() );
  }

  if( XCAFDoc_ShapeTool::IsCompound(L) || XCAFDoc_ShapeTool::IsAssembly(L) ) {
    if(L.HasChild()) {
      for(Standard_Integer ich=1; ich<=L.NbChildren(); ich++) {
        WritePropsForLabel(WS,aSTool,myLabels,L.FindChild(ich),multi);
      }
    }
  }

  return Standard_True;
}


//=======================================================================
//function : WriteValProps
//purpose  :
//=======================================================================

Standard_Boolean STEPCAFControl_Writer::WriteValProps (const Handle(XSControl_WorkSession) &WS,
						       const TDF_LabelSequence &labels,
						       const Standard_CString multi) const
{
  if ( labels.Length() <=0 ) return Standard_False;

  // get working data
//  STEPConstruct_ValidationProps Props ( WS );
  Handle(XCAFDoc_ShapeTool) aSTool = XCAFDoc_DocumentTool::ShapeTool( labels(1) );

  // Iterate on requested shapes
  for ( Standard_Integer i=1; i <= labels.Length(); i++ ) {
    TDF_Label L = labels.Value(i);

    WritePropsForLabel(WS,aSTool,myLabels,L,multi);
/*    
    // find target STEP entity for the current shape
    if ( ! myLabels.IsBound ( L ) ) continue; // not recorded as translated, skip
    TopoDS_Shape S = myLabels.Find ( L );

    // write area and volume (except for components in multifile mode)
    if ( ! multi || XCAFDoc_ShapeTool::IsAssembly ( L ) ) {
      Handle(XCAFDoc_Area) A;
      L.FindAttribute ( XCAFDoc_Area::GetID(), A );
      if ( ! A.IsNull() ) Props.AddArea ( S, A->Get() );

      Handle(XCAFDoc_Volume) V;
      L.FindAttribute ( XCAFDoc_Volume::GetID(), V );
      if ( ! V.IsNull() ) Props.AddVolume ( S, V->Get() );
    }

    // write centroid
    Handle(XCAFDoc_Centroid) C;
    L.FindAttribute ( XCAFDoc_Centroid::GetID(), C );
    if ( ! C.IsNull() ) Props.AddCentroid ( S, C->Get() );

    // write centroid for components of assemblies
    if ( XCAFDoc_ShapeTool::IsAssembly ( L ) ) {
      TDF_LabelSequence seq;
      XCAFDoc_ShapeTool::GetComponents ( L, seq );
      for (Standard_Integer k=1; k <= seq.Length(); k++) {
	TDF_Label lab = seq(k);

	// get shape with correct location
	TDF_Label Lref;
	if ( ! XCAFDoc_ShapeTool::GetReferredShape ( lab, Lref ) || 
	     ! myLabels.IsBound ( Lref ) ) continue;
	TopLoc_Location Loc = XCAFDoc_ShapeTool::GetLocation ( lab );
	S = myLabels.Find ( Lref );
	S.Move ( Loc );
		
	C.Nullify();
	lab.FindAttribute ( XCAFDoc_Centroid::GetID(), C );
	// if centroid is not assigned to an instance, 
	// use (shifted) centroid of original shape
	gp_Pnt center;
	if ( C.IsNull() ) {
	  Lref.FindAttribute ( XCAFDoc_Centroid::GetID(), C );
	  if ( C.IsNull() ) continue;
	  center = C->Get().Transformed ( Loc.Transformation() );
	}
	else center = C->Get();

	Props.AddCentroid ( S, center, Standard_True );
      }
    }
*/
  }

  return Standard_True;
}


//=======================================================================
//function : WriteLayers
//purpose  : 
//=======================================================================

Standard_Boolean STEPCAFControl_Writer::WriteLayers (const Handle(XSControl_WorkSession) &WS,
						     const TDF_LabelSequence  &labels ) const
{
  
  if ( labels.Length() <=0 ) return Standard_False;

  // get working data
  Handle(Interface_InterfaceModel) Model = WS->Model();
  Handle(XSControl_TransferWriter) TW = WS->TransferWriter();
  Handle(Transfer_FinderProcess) FP = TW->FinderProcess();
  Handle(XCAFDoc_LayerTool) LTool = XCAFDoc_DocumentTool::LayerTool( labels(1) );
  if (LTool.IsNull() ) return Standard_False;

  TDF_LabelSequence LayerLS;
  LTool->GetLayerLabels(LayerLS);
  if ( LayerLS.Length() <=0 ) return Standard_False;

  // Iterate on requested layers and for each layer take set of shapes.
  for ( Standard_Integer i=1; i <= LayerLS.Length(); i++ ) {
    TDF_Label L = LayerLS.Value(i);
    
    // get labels of shapes in that layer
    TDF_LabelSequence ShapeLs;
    LTool->GetShapesOfLayer(L, ShapeLs);
    if ( ShapeLs.Length() <=0 ) continue;
    
    // name of layer: if not set, is considered as being empty
    Handle(TCollection_HAsciiString) hName = new TCollection_HAsciiString;
    GetLabelName ( L, hName );

    // Find target STEP entity for each shape and add to StepVisual_PresentationLayerAssignment items.
    TColStd_SequenceOfTransient seqRI;
    for ( Standard_Integer j=1; j <= ShapeLs.Length(); j++) {
      TDF_Label shLabel = ShapeLs.Value(j);
      if ( shLabel.IsNull() ) continue;
      
      // there is no way to assign layer to instance in STEP
      if ( XCAFDoc_ShapeTool::IsAssembly ( shLabel ) ||
           XCAFDoc_ShapeTool::IsReference ( shLabel ) )
        continue;
      
      // check that the shape is one of (uub)labels written during current transfer
      Standard_Integer k = 1;
      for ( ; k <= labels.Length(); k++ )
	if ( shLabel.IsDescendant ( labels(k) ) ) break;
      if ( k > labels.Length() ) continue;

      // get target STEP entity
      TopoDS_Shape oneShape = XCAFDoc_ShapeTool::GetShape(shLabel);
      
      TopLoc_Location Loc;
#ifdef DEB    
      Standard_Integer nb = 
#endif
	FindEntities ( FP, oneShape, Loc, seqRI );
#ifdef DEB
      if ( nb <=0 ) cout << "Warning: Cannot find RI for " << oneShape.TShape()->DynamicType()->Name() << endl;
#endif
    }
    if ( seqRI.Length() <= 0 ) continue;

    // analyze visibility
    Handle(StepVisual_PresentationLayerAssignment) StepLayerAs = new StepVisual_PresentationLayerAssignment;
    Handle(TCollection_HAsciiString) descr;
    Handle(TDataStd_UAttribute) aUAttr;
    Standard_Boolean isLinv = Standard_False;
    if (L.FindAttribute(XCAFDoc::InvisibleGUID(), aUAttr)) {
      descr = new TCollection_HAsciiString ("invisible");
#ifdef DEB
      cout<< "\tLayer \"" << hName->String().ToCString() << "\" is invisible"<<endl;
#endif
      isLinv = Standard_True;
    }
    else descr = new TCollection_HAsciiString ("visible");
    
    // create layer entity
    Handle(StepVisual_HArray1OfLayeredItem) HArrayOfLItem = 
      new StepVisual_HArray1OfLayeredItem ( 1, seqRI.Length() );
    for (Standard_Integer i1 = 1; i1<=seqRI.Length(); i1++) {
      StepVisual_LayeredItem LI;
      LI.SetValue ( seqRI.Value(i1) );
      HArrayOfLItem->SetValue( i1, LI );
    }
    StepLayerAs->Init(hName, descr, HArrayOfLItem);
    Model->AddWithRefs( StepLayerAs );
    // PTV 23.01.2003 add the invisibility AFTER adding layer into the model.
    // add the invisibility for the layer
    if (isLinv) {
      // Invisibility Item for containig invisible layers.
      Handle(StepVisual_HArray1OfInvisibleItem) HInvsblItm = new StepVisual_HArray1OfInvisibleItem (1,1);
      StepVisual_InvisibleItem InvIt;
      InvIt.SetValue( StepLayerAs );
      HInvsblItm->SetValue( 1, InvIt);
      
      Handle(StepVisual_Invisibility) Invsblt = new StepVisual_Invisibility();
      Invsblt->Init( HInvsblItm );
      Model->AddWithRefs( Invsblt );
    }
  }
  return Standard_True;
}


//=======================================================================
//function : getSHUOstyle
//purpose  : auxilary
//=======================================================================
static Standard_Boolean getSHUOstyle(const TDF_Label& aSHUOlab,
                                     const Handle(XCAFDoc_ColorTool)& CTool,
                                     XCAFPrs_Style& SHUOstyle)
{
  Quantity_Color C;
  if (!CTool->IsVisible( aSHUOlab ) )
    SHUOstyle.SetVisibility(Standard_False);
  else {
    if ( CTool->GetColor ( aSHUOlab, XCAFDoc_ColorGen, C ) ) {
      SHUOstyle.SetColorCurv ( C );
      SHUOstyle.SetColorSurf ( C );
    }
    if ( CTool->GetColor ( aSHUOlab, XCAFDoc_ColorSurf, C ) )
      SHUOstyle.SetColorSurf ( C );
    if ( CTool->GetColor ( aSHUOlab, XCAFDoc_ColorCurv, C ) )
      SHUOstyle.SetColorCurv ( C );
  }
  if ( !SHUOstyle.IsSetColorCurv() && 
      !SHUOstyle.IsSetColorSurf() &&
      SHUOstyle.IsVisible() )
    return Standard_False;
  return Standard_True;
}


//=======================================================================
//function : getProDefinitionOfNAUO
//purpose  : auxilary
//=======================================================================
static Standard_Boolean getProDefinitionOfNAUO(const Handle(XSControl_WorkSession)& WS,
                                               const TopoDS_Shape& theShape,
                                               Handle(StepBasic_ProductDefinition)& PD,
                                               Handle(StepRepr_NextAssemblyUsageOccurrence)& NAUO,
                                               Standard_Boolean IsRelating)
{
  if ( theShape.IsNull() )
    return Standard_False;
  // get CDSR
  Handle(XSControl_TransferWriter) TW = WS->TransferWriter();
  Handle(Transfer_FinderProcess) FP = TW->FinderProcess();
  Handle(StepShape_ContextDependentShapeRepresentation) CDSR;
  Handle(TransferBRep_ShapeMapper) mapper = TransferBRep::ShapeMapper ( FP, theShape );
  if (!FP->FindTypedTransient(mapper, 
                              STANDARD_TYPE(StepShape_ContextDependentShapeRepresentation),
                              CDSR))
    return Standard_False;
  // get PDS of NAUO
  Handle(StepRepr_ProductDefinitionShape) PDS = CDSR->RepresentedProductRelation();
  if (PDS.IsNull())
    return Standard_False;
  // get the NAUO entity
  Interface_Graph aGraph = WS->HGraph()->Graph();
  Interface_EntityIterator subs = aGraph.Shareds(PDS);
  for ( subs.Start(); subs.More(); subs.Next() ) {
    if (!subs.Value()->IsKind(STANDARD_TYPE(StepRepr_NextAssemblyUsageOccurrence)))
      continue;
    NAUO = Handle(StepRepr_NextAssemblyUsageOccurrence)::DownCast(subs.Value());
    break;
  }
  if ( NAUO.IsNull() )
    return Standard_False;
  // get Relatinf or Related product definition
  if ( !IsRelating )
    PD = NAUO->RelatedProductDefinition();
  else
    PD = NAUO->RelatingProductDefinition();
  if ( PD.IsNull() )
    return Standard_False;
  return Standard_True;
}


//=======================================================================
//function : writeSHUO
//purpose  : auxilary
//=======================================================================
static Standard_Boolean writeSHUO (const Handle(XCAFDoc_GraphNode)& theSHUO,
                                   const Handle(XCAFDoc_ShapeTool)& theSTool,
                                   const Handle(XSControl_WorkSession)& WS,
                                   Handle(StepRepr_SpecifiedHigherUsageOccurrence)& theTopSHUO,
                                   TopoDS_Shape& NAUOShape,
                                   Handle(StepBasic_ProductDefinition)& theRelatingPD,
                                   Standard_Boolean& isDeepest)
{
  // set the ProductDefinitionRelationship descriptin information as empty strings.
  Handle(TCollection_HAsciiString) EmptyString = new TCollection_HAsciiString("");
  
  TDF_LabelSequence aNextUsageLabs;
  theSTool->GetSHUONextUsage( theSHUO->Label(), aNextUsageLabs );
  Handle(XCAFDoc_GraphNode) NuSHUO;
  if ( theTopSHUO.IsNull() ) {
    // the top SHUO
    if (aNextUsageLabs.Length() < 1)
      return Standard_False;
    theSTool->GetSHUO( aNextUsageLabs.Value(1), NuSHUO );
    if (NuSHUO.IsNull())
      return Standard_False;
    // get relating product definition
    TopoDS_Shape aTopCompShape = theSTool->GetShape( theSHUO->Label().Father() ); 
    Handle(StepRepr_NextAssemblyUsageOccurrence) UUNAUO;
    if (!getProDefinitionOfNAUO( WS, aTopCompShape,
                                 theRelatingPD, UUNAUO, Standard_True ))
      return Standard_False;
    // get related product definition
    TopoDS_Shape aNUShape = theSTool->GetShape( NuSHUO->Label().Father() );
    Handle(StepBasic_ProductDefinition) aRelatedPD;
    Handle(StepRepr_NextAssemblyUsageOccurrence) NUNAUO;
    if (!getProDefinitionOfNAUO( WS, aNUShape,
                                 aRelatedPD, NUNAUO, Standard_False ))
      return Standard_False;
    
    theTopSHUO = new StepRepr_SpecifiedHigherUsageOccurrence;
    // create deepest shuo EmptyString
    theTopSHUO->Init(/*id*/EmptyString, /*name*/EmptyString,
                     /*no description*/Standard_False,/*description*/EmptyString,
                     theRelatingPD, aRelatedPD,
                     /*no ACURefDesignator*/Standard_False,/*ACURefDesignator*/EmptyString,
                     /*upper_usage*/UUNAUO, /*next_usage*/NUNAUO);
    // write the other SHUO.
    if(!writeSHUO( NuSHUO, theSTool, WS, theTopSHUO, NAUOShape, theRelatingPD, isDeepest )) {
      theTopSHUO.Nullify();
      return Standard_False;
    }
    
    return Standard_True;
  }
//   Handle(XCAFDoc_GraphNode) NuSHUO;
  if ( aNextUsageLabs.Length() > 0) {
    // store SHUO recursive
#ifdef DEB
    if ( aNextUsageLabs.Length() > 1 )
      cout << "Warning: store only one next_usage of current SHUO"  << endl;
#endif    
    theSTool->GetSHUO( aNextUsageLabs.Value(1), NuSHUO );
    Handle(StepRepr_SpecifiedHigherUsageOccurrence) aNUEntSHUO =
      new StepRepr_SpecifiedHigherUsageOccurrence;
    if (!writeSHUO( NuSHUO, theSTool, WS, aNUEntSHUO, NAUOShape, theRelatingPD, isDeepest ))
      return Standard_False;
    
    // store the deepest SHUO to the dociment
    TopoDS_Shape aNUSh, aUUSh;
    aNUSh = theSTool->GetShape( NuSHUO->Label().Father() );
    aUUSh = theSTool->GetShape( theSHUO->Label().Father() );
    // get relating PD with upper_usage and related PD with next_usage
    Handle(StepBasic_ProductDefinition) nullPD;// no need to use,case have shared <theRelatingPD>
    Handle(StepBasic_ProductDefinition) aRelatedPD;
    Handle(StepRepr_NextAssemblyUsageOccurrence) UUNAUO, NUNAUO;
    if (!getProDefinitionOfNAUO( WS, aUUSh, nullPD, UUNAUO, Standard_True ) ||
        !getProDefinitionOfNAUO( WS, aNUSh, aRelatedPD, NUNAUO, Standard_False )) {
#ifdef DEB
      cout << "Warning: cannot get related or relating PD" << endl;
#endif
      return Standard_False;
    }
    aNUEntSHUO->Init(/*id*/EmptyString, /*name*/EmptyString,
                     /*no description*/Standard_False,/*description*/EmptyString,
                     theRelatingPD, aRelatedPD,
                     /*no ACURefDesignator*/Standard_False,/*ACURefDesignator*/EmptyString,
                     /*upper_usage*/theTopSHUO, /*next_usage*/NUNAUO);
    if ( isDeepest ) {
      isDeepest = Standard_False;
    }
    WS->Model()->AddWithRefs ( aNUEntSHUO );
    return Standard_True;
  } // end of recurse storing
    
  // get shape 
  TDF_Label aShapeL = theSHUO->Label().Father();
  NAUOShape = theSTool->GetShape( aShapeL );
  // return to the deepest level from SHUO shape level
  // it is because SHUO is attribute on deep level and shape level.
  isDeepest = Standard_True;
  return Standard_True;
}


//=======================================================================
//function : createSHUOStyledItem
//purpose  : auxilary
//=======================================================================
static Standard_Boolean createSHUOStyledItem (const XCAFPrs_Style& style,
                                              const Handle(StepRepr_ProductDefinitionShape)& PDS,
                                              const Handle(XSControl_WorkSession) &WS,
                                              const TopoDS_Shape& Sh,
                                              const Handle(XCAFDoc_ShapeTool)& STool,
                                              STEPCAFControl_DataMapOfShapeTransient& myMapCompMDGPR)
{
  // create styled item for the indicated SHUO and store to the model
  STEPConstruct_Styles Styles( WS );
  // translate colors to STEP
  Handle(StepVisual_Colour) surfColor, curvColor;
  if ( style.IsSetColorSurf() )
    surfColor = Styles.EncodeColor ( style.GetColorSurf() );
  if ( style.IsSetColorCurv() )
    curvColor = Styles.EncodeColor ( style.GetColorCurv() );
  Standard_Boolean isComponent = Standard_True;// cause need to get PSBC
  Handle(StepRepr_RepresentationItem) item;
  // set default color for invisible SHUO.
  Standard_Boolean isSetDefaultColor = Standard_False;
  if (surfColor.IsNull() && curvColor.IsNull() && !style.IsVisible() ) {
    surfColor = Styles.EncodeColor ( Quantity_Color( 1, 1, 1, Quantity_TOC_RGB ) );
    isSetDefaultColor = Standard_True;
  }
  Handle(StepVisual_PresentationStyleAssignment) PSA =
    Styles.MakeColorPSA ( item, surfColor, curvColor, isComponent );
  Handle(StepVisual_StyledItem) override; //null styled item
  
  // find the repr item of the shape
  Handle(XSControl_TransferWriter) TW = WS->TransferWriter();
  Handle(Transfer_FinderProcess) FP = TW->FinderProcess();
  Handle(TransferBRep_ShapeMapper) mapper = TransferBRep::ShapeMapper ( FP, Sh );
  Handle(StepShape_ContextDependentShapeRepresentation) CDSR;
  FP->FindTypedTransient(mapper, 
                         STANDARD_TYPE(StepShape_ContextDependentShapeRepresentation),
                         CDSR);
  if ( CDSR.IsNull() )
    return Standard_False;
  // find context
  Handle(StepRepr_RepresentationContext) Context = Styles.FindContext( Sh );
  TopoDS_Shape aTopSh = Sh;
  if (Context.IsNull()) {
    TDF_Label aTopShL = STool->FindShape(Sh, Standard_False);
    if (aTopShL.IsNull())
      return Standard_False;
    aTopSh = STool->GetShape( aTopShL );
    Context = Styles.FindContext ( aTopSh );
  }
  if (Context.IsNull())
    return Standard_False;
  // get representation item of the shape
  TopLoc_Location L;
  TColStd_SequenceOfTransient seqRI;
  Standard_Integer nb = FindEntities ( FP, Sh, L, seqRI );
#ifdef DEB
      if ( nb <=0 ) cout << "Warning: Cannot find RI for " << Sh.TShape()->DynamicType()->Name() << endl;
#endif
  item = Handle(StepRepr_RepresentationItem)::DownCast(seqRI(1));
  //get overridden styled item
  getStyledItem(Sh,STool, Styles, override,myMapCompMDGPR);
  
  // get STEP STYLED ITEM
  Handle(StepVisual_StyledItem) STEPstyle = Styles.AddStyle ( item, PSA, override );
  // create SR, SDR and all necessary references between them and ST, PDS, PSBC, GRC
  Styles.CreateNAUOSRD( Context, CDSR, PDS );
  
  // add step styled item of SHUO to the model
  // do it by additing styled item to the MDGPR
  if ( !aTopSh.IsNull() &&  !myMapCompMDGPR.IsBound( aTopSh ) ) {
    // create MDGPR and record it in model
#ifdef DEB
    cout << "Warning: " << __FILE__ << ": Create new MDGPR for SHUO instance"  << endl;
#endif
    Handle(StepVisual_MechanicalDesignGeometricPresentationRepresentation) aMDGPR;
    Styles.CreateMDGPR ( Context, aMDGPR );
    if (!aMDGPR.IsNull())
      myMapCompMDGPR.Bind( aTopSh, aMDGPR );
  }
  else if ( !aTopSh.IsNull() &&  myMapCompMDGPR.IsBound( aTopSh ) ) {
    // get MDGPR of the top-level shape
    Handle(StepVisual_PresentationRepresentation) aMDGPR = 
      Handle(StepVisual_PresentationRepresentation)::DownCast( myMapCompMDGPR.Find( aTopSh ) );
    // get old styled items to not lose it
    Handle(StepRepr_HArray1OfRepresentationItem) oldItems = aMDGPR->Items();
    Standard_Integer oldLengthlen = 0;
    if (!oldItems.IsNull())
      oldLengthlen = oldItems->Length();
    // create new array of styled items by an olds and new one
    Handle(StepRepr_HArray1OfRepresentationItem) newItems =
      new StepRepr_HArray1OfRepresentationItem(1, oldLengthlen + 1);
    Standard_Integer si;
    Standard_Integer el = 1;
    for ( si=1; si <= oldLengthlen; si++ )
      newItems->SetValue( el++, oldItems->Value( si ) );
    newItems->SetValue( el++, Handle(StepRepr_RepresentationItem)::DownCast(STEPstyle) );
    // init MDGPR be new array of styled items
    if (newItems->Length() > 0)
      aMDGPR->SetItems( newItems );
  }
  else {
    WS->Model()->AddWithRefs ( STEPstyle ); // add as root to the model, but it is not good
#ifdef DEB
    cout << "Warning: " << __FILE__ << ": adds styled item of SHUO as root, casue cannot find MDGPR" << endl;
#endif
  }
  // create invisibility item for the styled item
  if ( !style.IsVisible() ) {
    if (isSetDefaultColor) {
      // try to set default color from top-level shape
      
      setDefaultInstanceColor(override, PSA);
    }
    // create invisibility item and refer for stiledItem
    Handle(StepVisual_Invisibility) Invsblt = new StepVisual_Invisibility();
    Handle(StepVisual_HArray1OfInvisibleItem) HInvsblItm = 
      new StepVisual_HArray1OfInvisibleItem (1,1);
    // put all style item into the harray
    StepVisual_InvisibleItem anInvItem;
    anInvItem.SetValue( STEPstyle );
    HInvsblItm->SetValue( 1, anInvItem );
    Invsblt->Init( HInvsblItm );
    WS->Model()->AddWithRefs( Invsblt );
  }
  
  return Standard_True;
}


//=======================================================================
//function : WriteSHUOs
//purpose  : 
//=======================================================================

Standard_Boolean STEPCAFControl_Writer::WriteSHUOs (const Handle(XSControl_WorkSession) &WS,
                                                    const TDF_LabelSequence  &labels )
{
  if ( labels.Length() <=0 ) return Standard_False;

  // get working data
  Handle(Interface_InterfaceModel) Model = WS->Model();
  Handle(XSControl_TransferWriter) TW = WS->TransferWriter();
  Handle(Transfer_FinderProcess) FP = TW->FinderProcess();
  Handle(XCAFDoc_ColorTool) CTool = XCAFDoc_DocumentTool::ColorTool( labels(1) );
  if (CTool.IsNull() )
    return Standard_False;
  // map of transfered SHUO
  TColStd_MapOfTransient aMapOfMainSHUO;
//   TColStd_IndexedDataMapOfTransientTransient aIndxMapOfSHUOEnt;
  // Iterate on requested shapes
  for ( Standard_Integer i=1; i <= labels.Length(); i++ ) {
    TDF_Label L = labels.Value(i);
    if ( ! myLabels.IsBound ( L ) ) continue; // not recorded as translated, skip
//     TopoDS_Shape S = myLabels.Find ( L );
    if ( XCAFDoc_ShapeTool::IsAssembly ( L ) ) {
      TDF_LabelSequence seq;
      XCAFDoc_ShapeTool::GetComponents ( L, seq );
      // iterates on components of assembly
      for (Standard_Integer k=1; k <= seq.Length(); k++) {
	TDF_Label lab = seq(k);
        TDF_AttributeSequence anAttrSeq;
        CTool->ShapeTool()->GetAllComponentSHUO( lab, anAttrSeq );
        // work with SHUO
        for (Standard_Integer j = 1; j <= anAttrSeq.Length(); j++) {
          Handle(XCAFDoc_GraphNode) aSHUO = 
            Handle(XCAFDoc_GraphNode)::DownCast(anAttrSeq.Value( j ));
          // take label of SHUO
          TDF_Label aSHUOlab = aSHUO->Label();
          TDF_LabelSequence aUpLabels;
          // check is it SHUO of upper_usage
          CTool->ShapeTool()->GetSHUOUpperUsage( aSHUOlab, aUpLabels );
          if ( aUpLabels.Length() > 0 )
            continue; // transfer only main SHUO
          if ( aMapOfMainSHUO.Contains( aSHUO ) )
            continue; // do not try to transfer SHUO twice
          aMapOfMainSHUO.Add( aSHUO );
          // check if it is styled SHUO
          XCAFPrs_Style SHUOstyle;
          if ( !getSHUOstyle ( aSHUOlab, CTool, SHUOstyle ) ) {
#ifdef DEB
            cout << "Warning: " << __FILE__ << ": do not store SHUO without any style to the STEP model" << endl;
#endif
            continue;
          }
          // write SHUO to the model amd then add structure type.
          TopoDS_Shape NAUOShape; // shape of the deepest NAUO in the SHUO structure
          Standard_Boolean isDeepest = Standard_False;
          Handle(StepRepr_SpecifiedHigherUsageOccurrence) anEntOfSHUO;
          Handle(StepBasic_ProductDefinition) aRelatingPD;
          // create the top SHUO and all other.
          writeSHUO( aSHUO, CTool->ShapeTool(), WS, anEntOfSHUO, NAUOShape, aRelatingPD, isDeepest );
          if ( anEntOfSHUO.IsNull() || NAUOShape.IsNull() ) {
#ifdef DEB
            cout << "Warning: " << __FILE__ << ": Cannot store SHUO" << endl;
#endif
            continue;
          }
          // create new Product Definition Shape for TOP SHUO
#ifdef DEB
            cout << "Info: " << __FILE__ << ": Create NEW PDS for current SHUO " << endl;
#endif
          Handle(StepRepr_ProductDefinitionShape) PDS = new StepRepr_ProductDefinitionShape;
          Handle(TCollection_HAsciiString) aPDSname = new TCollection_HAsciiString("SHUO");
          Handle(TCollection_HAsciiString) descrStr = new TCollection_HAsciiString("");
          StepRepr_CharacterizedDefinition aCharDef;
          aCharDef.SetValue( anEntOfSHUO );
          PDS->Init( aPDSname, Standard_False, descrStr, aCharDef );
          
          // create styled item for SHUO and add to the model
          createSHUOStyledItem ( SHUOstyle, PDS, WS, NAUOShape, CTool->ShapeTool(), myMapCompMDGPR );
          
        } // end work with SHUO
      } // end of an assembly components
    } // end of IsAssembly case
    // nothing to do if it is not assembly
    continue;
  } // end of iterates on indicated labels
  return Standard_True;
}


//=======================================================================
//function : FindPDSforDGT
//purpose  : auxilary: find PDS for AdvancedFace or EdgeCurve for creation
//                     needed ShapeAspect in D&GT structure
//=======================================================================
static Standard_Boolean FindPDSforDGT(const Interface_Graph &aGraph,
                                      const Handle(Standard_Transient) &ent,
                                      Handle(StepRepr_ProductDefinitionShape) &PDS,
                                      Handle(StepRepr_RepresentationContext) &RC,
                                      Handle(StepShape_AdvancedFace) &AF,
                                      Handle(StepShape_EdgeCurve) &EC)
{
  if( !ent->IsKind(STANDARD_TYPE(StepShape_EdgeCurve)) && 
      !ent->IsKind(STANDARD_TYPE(StepShape_AdvancedFace)) ) 
    return Standard_False;

  AF = Handle(StepShape_AdvancedFace)::DownCast(ent);
  if( ent->IsKind(STANDARD_TYPE(StepShape_EdgeCurve)) ) {
    EC = Handle(StepShape_EdgeCurve)::DownCast(ent);
    Interface_EntityIterator subs = aGraph.Sharings(EC);
    for(subs.Start(); subs.More() && AF.IsNull(); subs.Next()) {
      Handle(StepShape_OrientedEdge) OE = Handle(StepShape_OrientedEdge)::DownCast(subs.Value());
      if(OE.IsNull()) continue;
      Interface_EntityIterator subs1 = aGraph.Sharings(OE);
      for(subs1.Start(); subs1.More() && AF.IsNull(); subs1.Next()) {
        Handle(StepShape_EdgeLoop) EL = Handle(StepShape_EdgeLoop)::DownCast(subs1.Value());
        if(EL.IsNull()) continue;
        Interface_EntityIterator subs2 = aGraph.Sharings(EL);
        for(subs2.Start(); subs2.More() && AF.IsNull(); subs2.Next()) {
          Handle(StepShape_FaceBound) FB = Handle(StepShape_FaceBound)::DownCast(subs2.Value());
          if(FB.IsNull()) continue;
          Interface_EntityIterator subs3 = aGraph.Sharings(FB);
          for(subs3.Start(); subs3.More() && AF.IsNull(); subs3.Next()) {
            AF = Handle(StepShape_AdvancedFace)::DownCast(subs3.Value());
          }
        }
      }
    }
  }
  if(AF.IsNull()) return Standard_False;

  Interface_EntityIterator subs = aGraph.Sharings(AF);
  for(subs.Start(); subs.More() && PDS.IsNull(); subs.Next()) {
    Handle(StepShape_ConnectedFaceSet) CFS =
      Handle(StepShape_ConnectedFaceSet)::DownCast(subs.Value());
    if(CFS.IsNull()) continue;
    Interface_EntityIterator subs1 = aGraph.Sharings(CFS);
    for(subs1.Start(); subs1.More() && PDS.IsNull(); subs1.Next()) {
      Handle(StepRepr_RepresentationItem) RI = 
        Handle(StepRepr_RepresentationItem)::DownCast(subs1.Value());
      if(RI.IsNull()) continue;
      Interface_EntityIterator subs2 = aGraph.Sharings(RI);
      for(subs2.Start(); subs2.More() && PDS.IsNull(); subs2.Next()) {
        Handle(StepShape_ShapeRepresentation) SR = 
          Handle(StepShape_ShapeRepresentation)::DownCast(subs2.Value());
        if(SR.IsNull()) continue;
        RC = SR->ContextOfItems();
        Interface_EntityIterator subs3 = aGraph.Sharings(SR);
        for(subs3.Start(); subs3.More() && PDS.IsNull(); subs3.Next()) {
          Handle(StepShape_ShapeDefinitionRepresentation) SDR = 
            Handle(StepShape_ShapeDefinitionRepresentation)::DownCast(subs3.Value());
          if(SDR.IsNull()) continue;
          Handle(StepRepr_PropertyDefinition) PropD = SDR->Definition().PropertyDefinition();
          if(PropD.IsNull()) continue;
          PDS = Handle(StepRepr_ProductDefinitionShape)::DownCast(PropD);
        }
      }
    }
  }
  
  return Standard_True;
}


//=======================================================================
//function : WriteDGTs
//purpose  : 
//=======================================================================

Standard_Boolean STEPCAFControl_Writer::WriteDGTs (const Handle(XSControl_WorkSession) &WS,
                                                   const TDF_LabelSequence  &labels ) const
{
  
  if ( labels.Length() <=0 ) return Standard_False;

  // get working data
  Handle(Interface_InterfaceModel) Model = WS->Model();
  Handle(XSControl_TransferWriter) TW = WS->TransferWriter();
  Handle(Transfer_FinderProcess) FP = TW->FinderProcess();
  Interface_Graph aGraph = WS->HGraph()->Graph();
  Handle(XCAFDoc_DimTolTool) DGTTool = XCAFDoc_DocumentTool::DimTolTool( labels(1) );
  if(DGTTool.IsNull() ) return Standard_False;

  TDF_LabelSequence DGTLabels;
  STEPConstruct_DataMapOfAsciiStringTransient DatumMap;

  // write Datums
  DGTTool->GetDatumLabels(DGTLabels);
  if(DGTLabels.Length()<=0) return Standard_False;
  Standard_Integer i;
  for(i=1; i<=DGTLabels.Length(); i++) {
    TDF_Label DatumL = DGTLabels.Value(i);
    TDF_Label ShapeL;
    if(!DGTTool->GetRefShapeLabel(DatumL,ShapeL)) continue;
    // find target shape
    TopoDS_Shape aShape = XCAFDoc_ShapeTool::GetShape(ShapeL);
    TopLoc_Location Loc;
    TColStd_SequenceOfTransient seqRI;
    Standard_Integer nb =  FindEntities( FP, aShape, Loc, seqRI );
#ifdef DEB
    if(nb<=0) cout<<"Warning: Cannot find RI for "<<aShape.TShape()->DynamicType()->Name()<<endl;
#endif
    if(seqRI.Length()<=0) continue;
    Handle(StepRepr_ProductDefinitionShape) PDS;
    Handle(StepRepr_RepresentationContext) RC;
    Handle(Standard_Transient) ent = seqRI.Value(1);
    Handle(StepShape_AdvancedFace) AF;
    Handle(StepShape_EdgeCurve) EC;
    FindPDSforDGT(aGraph,ent,PDS,RC,AF,EC);
    if(PDS.IsNull()) continue;
    //cout<<"Model->Number(PDS)="<<Model->Number(PDS)<<endl;
    Handle(XCAFDoc_Datum) DatumAttr;
    if(!DatumL.FindAttribute(XCAFDoc_Datum::GetID(),DatumAttr)) continue;
    Handle(TCollection_HAsciiString) aName = DatumAttr->GetName();
    Handle(TCollection_HAsciiString) aDescription = DatumAttr->GetDescription();
    Handle(TCollection_HAsciiString) anIdentification = DatumAttr->GetIdentification();
    Handle(StepDimTol_DatumFeature) DF = new StepDimTol_DatumFeature;
    Handle(StepDimTol_Datum) aDatum = new StepDimTol_Datum;
    DF->Init(aName, new TCollection_HAsciiString, PDS, StepData_LTrue);
    Model->AddWithRefs(DF);
    aDatum->Init(aName, new TCollection_HAsciiString, PDS, StepData_LFalse, anIdentification);
    Model->AddWithRefs(aDatum);
    Handle(StepRepr_ShapeAspectRelationship) SAR = new StepRepr_ShapeAspectRelationship;
    SAR->SetName(aName);
    SAR->SetRelatingShapeAspect(DF);
    SAR->SetRelatedShapeAspect(aDatum);
    Model->AddWithRefs(SAR);
    // write chain for DatumFeature
    StepRepr_CharacterizedDefinition CD;
    CD.SetValue(DF);
    Handle(StepRepr_PropertyDefinition) PropD = new StepRepr_PropertyDefinition;
    PropD->Init(aName,Standard_True,aDescription,CD);
    Model->AddWithRefs(PropD);
    StepRepr_RepresentedDefinition RD;
    RD.SetValue(PropD);
    Handle(StepShape_ShapeRepresentation) SR = new StepShape_ShapeRepresentation;
    Handle(StepRepr_HArray1OfRepresentationItem) HARI =
      new StepRepr_HArray1OfRepresentationItem(1,1);
    HARI->SetValue(1,AF);
    SR->Init(aName,HARI,RC);
    Handle(StepShape_ShapeDefinitionRepresentation) SDR = new StepShape_ShapeDefinitionRepresentation;
    SDR->Init(RD,SR);
    Model->AddWithRefs(SDR);
    // write chain for Datum 
    StepRepr_CharacterizedDefinition CD1;
    CD1.SetValue(aDatum);
    Handle(StepRepr_PropertyDefinition) PropD1 = new StepRepr_PropertyDefinition;
    PropD1->Init(aName,Standard_True,aDescription,CD1);
    Model->AddWithRefs(PropD1);
    StepRepr_RepresentedDefinition RD1;
    RD1.SetValue(PropD1);
    Handle(StepShape_ShapeRepresentation) SR1 = new StepShape_ShapeRepresentation;
    Handle(StepRepr_HArray1OfRepresentationItem) HARI1 =
      new StepRepr_HArray1OfRepresentationItem(1,1);
    HARI1->SetValue(1,AF->FaceGeometry());
    SR1->Init(aName,HARI1,RC);
    Model->AddWithRefs(SR1);
    Handle(StepShape_ShapeDefinitionRepresentation) SDR1 = new StepShape_ShapeDefinitionRepresentation;
    SDR1->Init(RD1,SR1);
    Model->AddWithRefs(SDR1);
    // add created Datum into Map
    TCollection_AsciiString stmp(aName->ToCString());
    stmp.AssignCat(aDescription->ToCString());
    stmp.AssignCat(anIdentification->ToCString());
    DatumMap.Bind(stmp,aDatum);
  }

  // write Tolerances and Dimensions
  DGTLabels.Clear();
  DGTTool->GetDimTolLabels(DGTLabels);
  if(DGTLabels.Length()<=0) return Standard_False;
  for(i=1; i<=DGTLabels.Length(); i++) {
    TDF_Label DimTolL = DGTLabels.Value(i);
    TDF_Label ShapeL;
    if(!DGTTool->GetRefShapeLabel(DimTolL,ShapeL)) continue;
    // find target shape
    TopoDS_Shape aShape = XCAFDoc_ShapeTool::GetShape(ShapeL);
    TopLoc_Location Loc;
    TColStd_SequenceOfTransient seqRI;
    Standard_Integer nb =  FindEntities( FP, aShape, Loc, seqRI );
#ifdef DEB
    if(nb<=0) cout<<"Warning: Cannot find RI for "<<aShape.TShape()->DynamicType()->Name()<<endl;
#endif
    if(seqRI.Length()<=0) continue;
    Handle(StepRepr_ProductDefinitionShape) PDS;
    Handle(StepRepr_RepresentationContext) RC;
    Handle(Standard_Transient) ent = seqRI.Value(1);
    Handle(StepShape_AdvancedFace) AF;
    Handle(StepShape_EdgeCurve) EC;
    FindPDSforDGT(aGraph,ent,PDS,RC,AF,EC);
    if(PDS.IsNull()) continue;
    //cout<<"Model->Number(PDS)="<<Model->Number(PDS)<<endl;

    Handle(XCAFDoc_DimTol) DimTolAttr;
    if(!DimTolL.FindAttribute(XCAFDoc_DimTol::GetID(),DimTolAttr)) continue;
    Standard_Integer kind = DimTolAttr->GetKind();
    Handle(TColStd_HArray1OfReal) aVal = DimTolAttr->GetVal();
    Handle(TCollection_HAsciiString) aName = DimTolAttr->GetName();
    Handle(TCollection_HAsciiString) aDescription = DimTolAttr->GetDescription();

    // common part of writing D&GT entities
    StepRepr_CharacterizedDefinition CD;
    Handle(StepRepr_ShapeAspect) SA = new StepRepr_ShapeAspect;
    SA->Init(aName, new TCollection_HAsciiString, PDS, StepData_LTrue);
    Model->AddWithRefs(SA);
    CD.SetValue(SA);
    Handle(StepRepr_PropertyDefinition) PropD = new StepRepr_PropertyDefinition;
    PropD->Init(aName,Standard_True,aDescription,CD);
    Model->AddWithRefs(PropD);
    StepRepr_RepresentedDefinition RD;
    RD.SetValue(PropD);
    Handle(StepShape_ShapeRepresentation) SR = new StepShape_ShapeRepresentation;
    Handle(StepRepr_HArray1OfRepresentationItem) HARI =
      new StepRepr_HArray1OfRepresentationItem(1,1);
    if(kind<20) 
      HARI->SetValue(1,EC);
    else
      HARI->SetValue(1,AF);
    SR->Init(aName,HARI,RC);
    Handle(StepShape_ShapeDefinitionRepresentation) SDR = new StepShape_ShapeDefinitionRepresentation;
    SDR->Init(RD,SR);
    Model->AddWithRefs(SDR);
    // define aUnit for creation LengthMeasureWithUnit (common for all)
    StepBasic_Unit aUnit;
    Handle(StepBasic_SiUnitAndLengthUnit) SLU;
    Handle(StepGeom_GeometricRepresentationContextAndGlobalUnitAssignedContext) Ctx =
      Handle(StepGeom_GeometricRepresentationContextAndGlobalUnitAssignedContext)::DownCast(RC);
    if(!Ctx.IsNull()) {
      for(Standard_Integer j=1; j<=Ctx->NbUnits(); j++) {
        if(Ctx->UnitsValue(j)->IsKind(STANDARD_TYPE(StepBasic_SiUnitAndLengthUnit))) {
          SLU = Handle(StepBasic_SiUnitAndLengthUnit)::DownCast(Ctx->UnitsValue(j));
          break;
        }
      }
    }
    if(SLU.IsNull()) {
      Handle(StepGeom_GeomRepContextAndGlobUnitAssCtxAndGlobUncertaintyAssCtx) Ctx1 =
        Handle(StepGeom_GeomRepContextAndGlobUnitAssCtxAndGlobUncertaintyAssCtx)::DownCast(RC);
      if(!Ctx1.IsNull()) {
        for(Standard_Integer j=1; j<=Ctx1->NbUnits(); j++) {
          if(Ctx1->UnitsValue(j)->IsKind(STANDARD_TYPE(StepBasic_SiUnitAndLengthUnit))) {
            SLU = Handle(StepBasic_SiUnitAndLengthUnit)::DownCast(Ctx1->UnitsValue(j));
            break;
          }
        }
      }
    }
    if(SLU.IsNull()) {
      SLU = new StepBasic_SiUnitAndLengthUnit;
    }
    aUnit.SetValue(SLU);

    // specific part of writing D&GT entities
    if(kind<20) { //dimension
      Handle(StepShape_DimensionalSize) DimSize = new StepShape_DimensionalSize;
      DimSize->Init(SA,aDescription);
      Model->AddWithRefs(DimSize);
      if(aVal->Length()>1) {
        // create MeasureWithUnits
        Handle(StepBasic_MeasureValueMember) MVM1 = new StepBasic_MeasureValueMember;
        MVM1->SetName("POSITIVE_LENGTH_MEASURE");
        MVM1->SetReal(aVal->Value(1));
        Handle(StepBasic_MeasureWithUnit) MWU1 = new StepBasic_MeasureWithUnit;
        MWU1->Init(MVM1,aUnit);
        Handle(StepBasic_MeasureValueMember) MVM2 = new StepBasic_MeasureValueMember;
        MVM2->SetName("POSITIVE_LENGTH_MEASURE");
        MVM2->SetReal(aVal->Value(2));
        Handle(StepBasic_MeasureWithUnit) MWU2 = new StepBasic_MeasureWithUnit;
        MWU2->Init(MVM2,aUnit);
        Handle(StepRepr_RepresentationItem) RI1 = new StepRepr_RepresentationItem;
        RI1->Init(new TCollection_HAsciiString("lower limit"));
        Handle(StepRepr_RepresentationItem) RI2 = new StepRepr_RepresentationItem;
        RI2->Init(new TCollection_HAsciiString("upper limit"));
        Handle(StepRepr_ReprItemAndLengthMeasureWithUnit) RILMU1 =
          new StepRepr_ReprItemAndLengthMeasureWithUnit;
        RILMU1->Init(MWU1,RI1);
        Handle(StepRepr_ReprItemAndLengthMeasureWithUnit) RILMU2 =
          new StepRepr_ReprItemAndLengthMeasureWithUnit;
        RILMU2->Init(MWU2,RI2);
        Model->AddWithRefs(RILMU1);
        Model->AddWithRefs(RILMU2);
        //Handle(StepRepr_CompoundItemDefinitionMember) CIDM =
        //  new StepRepr_CompoundItemDefinitionMember;
        //Handle(TColStd_HArray1OfTransient) ArrTr = new TColStd_HArray1OfTransient(1,2);
        //ArrTr->SetValue(1,RILMU1);
        //ArrTr->SetValue(2,RILMU2);
        //CIDM->SetArrTransient(ArrTr);
        //CIDM->SetName("SET_REPRESENTATION_ITEM");
        //StepRepr_CompoundItemDefinition CID;
        //CID.SetValue(CIDM);
        Handle(StepRepr_HArray1OfRepresentationItem) HARIVR =
          new StepRepr_HArray1OfRepresentationItem(1,2);
        HARIVR->SetValue(1,RILMU1);
        HARIVR->SetValue(2,RILMU2);
        Handle(StepRepr_ValueRange) VR = new StepRepr_ValueRange;
        //VR->Init(aName,CID);
        VR->Init(aName,HARIVR);
        Model->AddEntity(VR);
        Handle(StepShape_ShapeDimensionRepresentation) SDimR =
          new StepShape_ShapeDimensionRepresentation;
        Handle(StepRepr_HArray1OfRepresentationItem) HARI =
          new StepRepr_HArray1OfRepresentationItem(1,1);
        HARI->SetValue(1,VR);
        SDimR->Init(aName,HARI,RC);
        Model->AddWithRefs(SDimR);
        Handle(StepShape_DimensionalCharacteristicRepresentation) DimCharR =
          new StepShape_DimensionalCharacteristicRepresentation;
        StepShape_DimensionalCharacteristic DimChar;
        DimChar.SetValue(DimSize);
        DimCharR->Init(DimChar,SDimR);
        Model->AddEntity(DimCharR);
      }
    }
    else if(kind<50) { //tolerance
      if(kind<35) { // tolerance with datum system
        TDF_LabelSequence DatumLabels;
        DGTTool->GetDatumTolerLabels(DimTolL,DatumLabels);
        Standard_Integer NbDR = DatumLabels.Length();
        Handle(StepDimTol_HArray1OfDatumReference) HADR = new StepDimTol_HArray1OfDatumReference(1,NbDR);
        for(Standard_Integer j=1; j<=NbDR; j++) {
          Handle(XCAFDoc_Datum) DatumAttr;
          TDF_Label DatumL = DatumLabels.Value(j);
          if(!DatumL.FindAttribute(XCAFDoc_Datum::GetID(),DatumAttr)) continue;
          Handle(TCollection_HAsciiString) aNameD = DatumAttr->GetName();
          Handle(TCollection_HAsciiString) aDescriptionD = DatumAttr->GetDescription();
          Handle(TCollection_HAsciiString) anIdentificationD = DatumAttr->GetIdentification();
          TCollection_AsciiString stmp(aNameD->ToCString());
          stmp.AssignCat(aDescriptionD->ToCString());
          stmp.AssignCat(anIdentificationD->ToCString());
          if(DatumMap.IsBound(stmp)) {
            Handle(StepDimTol_Datum) aDatum = 
              Handle(StepDimTol_Datum)::DownCast(DatumMap.Find(stmp));
            Handle(StepDimTol_DatumReference) DR = new StepDimTol_DatumReference;
            DR->Init(j,aDatum);
            Model->AddWithRefs(DR);
            HADR->SetValue(j,DR);
          }
        }
        // create LengthMeasureWithUnit
        Handle(StepBasic_MeasureValueMember) MVM = new StepBasic_MeasureValueMember;
        MVM->SetName("LENGTH_MEASURE");
        MVM->SetReal(aVal->Value(1));
        Handle(StepBasic_LengthMeasureWithUnit) LMWU = new StepBasic_LengthMeasureWithUnit;
        LMWU->Init(MVM,aUnit);
        // create tolerance by it's type
        if(kind<24) {
          Handle(StepDimTol_GeometricToleranceWithDatumReference) GTWDR =
            new StepDimTol_GeometricToleranceWithDatumReference;
          GTWDR->SetDatumSystem(HADR);
          Handle(StepDimTol_ModifiedGeometricTolerance) MGT =
            new StepDimTol_ModifiedGeometricTolerance;
          if(kind==21) MGT->SetModifier(StepDimTol_MaximumMaterialCondition);
          else if(kind==22) MGT->SetModifier(StepDimTol_LeastMaterialCondition);
          else if(kind==23) MGT->SetModifier(StepDimTol_RegardlessOfFeatureSize);
          Handle(StepDimTol_GeoTolAndGeoTolWthDatRefAndModGeoTolAndPosTol) GTComplex =
            new StepDimTol_GeoTolAndGeoTolWthDatRefAndModGeoTolAndPosTol;
          GTComplex->Init(aName,aDescription,LMWU,SA,GTWDR,MGT);
          Model->AddWithRefs(GTComplex);
        }
        else if(kind==24) {
          Handle(StepDimTol_AngularityTolerance) aToler =
            new StepDimTol_AngularityTolerance;
          aToler->Init(aName,aDescription,LMWU,SA,HADR);
          Model->AddWithRefs(aToler);
        }
        else if(kind==25) {
          Handle(StepDimTol_CircularRunoutTolerance) aToler =
            new StepDimTol_CircularRunoutTolerance;
          aToler->Init(aName,aDescription,LMWU,SA,HADR);
          Model->AddWithRefs(aToler);
        }
        else if(kind==26) {
          Handle(StepDimTol_CoaxialityTolerance) aToler =
            new StepDimTol_CoaxialityTolerance;
          aToler->Init(aName,aDescription,LMWU,SA,HADR);
          Model->AddWithRefs(aToler);
        }
        else if(kind==27) {
          Handle(StepDimTol_ConcentricityTolerance) aToler =
            new StepDimTol_ConcentricityTolerance;
          aToler->Init(aName,aDescription,LMWU,SA,HADR);
          Model->AddWithRefs(aToler);
        }
        else if(kind==28) {
          Handle(StepDimTol_ParallelismTolerance) aToler =
            new StepDimTol_ParallelismTolerance;
          aToler->Init(aName,aDescription,LMWU,SA,HADR);
          Model->AddWithRefs(aToler);
        }
        else if(kind==29) {
          Handle(StepDimTol_PerpendicularityTolerance) aToler =
            new StepDimTol_PerpendicularityTolerance;
          aToler->Init(aName,aDescription,LMWU,SA,HADR);
          Model->AddWithRefs(aToler);
        }
        else if(kind==30) {
          Handle(StepDimTol_SymmetryTolerance) aToler =
            new StepDimTol_SymmetryTolerance;
          aToler->Init(aName,aDescription,LMWU,SA,HADR);
          Model->AddWithRefs(aToler);
        }
        else if(kind==31) {
          Handle(StepDimTol_TotalRunoutTolerance) aToler =
            new StepDimTol_TotalRunoutTolerance;
          aToler->Init(aName,aDescription,LMWU,SA,HADR);
          Model->AddWithRefs(aToler);
        }
      }
    }
  }

  return Standard_True;
}


//=======================================================================
//function : FindPDSforRI
//purpose  : auxilary: 
//=======================================================================
static Standard_Boolean FindPDSforRI(const Interface_Graph &aGraph,
                                     const Handle(Standard_Transient) &ent,
                                     Handle(StepRepr_ProductDefinitionShape) &PDS,
                                     Handle(StepRepr_RepresentationContext) &RC)
{
  if(!ent->IsKind(STANDARD_TYPE(StepRepr_RepresentationItem))) return Standard_False;
  Interface_EntityIterator subs = aGraph.Sharings(ent);
  for(subs.Start(); subs.More() && PDS.IsNull(); subs.Next()) {
    Handle(StepShape_ShapeRepresentation) SR = 
      Handle(StepShape_ShapeRepresentation)::DownCast(subs.Value());
    if(SR.IsNull()) continue;
    RC = SR->ContextOfItems();
    Interface_EntityIterator subs1 = aGraph.Sharings(SR);
    for(subs1.Start(); subs1.More() && PDS.IsNull(); subs1.Next()) {
      Handle(StepShape_ShapeDefinitionRepresentation) SDR = 
        Handle(StepShape_ShapeDefinitionRepresentation)::DownCast(subs1.Value());
      if(SDR.IsNull()) continue;
      Handle(StepRepr_PropertyDefinition) PropD = SDR->Definition().PropertyDefinition();
      if(PropD.IsNull()) continue;
      PDS = Handle(StepRepr_ProductDefinitionShape)::DownCast(PropD);
    }
  }
  return Standard_True;
}


//=======================================================================
//function : WriteMaterials
//purpose  : 
//=======================================================================

Standard_Boolean STEPCAFControl_Writer::WriteMaterials (const Handle(XSControl_WorkSession) &WS,
                                                        const TDF_LabelSequence  &labels ) const
{
  
  if ( labels.Length() <=0 ) return Standard_False;

  // get working data
  Handle(Interface_InterfaceModel) Model = WS->Model();
  Handle(XSControl_TransferWriter) TW = WS->TransferWriter();
  Handle(Transfer_FinderProcess) FP = TW->FinderProcess();
  Interface_Graph aGraph = WS->HGraph()->Graph();
  Handle(XCAFDoc_ShapeTool) ShTool = XCAFDoc_DocumentTool::ShapeTool( labels(1) );
  if(ShTool.IsNull() ) return Standard_False;
  Handle(XCAFDoc_MaterialTool) MatTool = XCAFDoc_DocumentTool::MaterialTool( labels(1) );
  if(MatTool.IsNull() ) return Standard_False;

  STEPConstruct_DataMapOfAsciiStringTransient MapDRI,MapMRI;
  TDF_LabelSequence TopLabels;
  ShTool->GetShapes(TopLabels);
  for(Standard_Integer i=1; i<=TopLabels.Length(); i++) {
    TDF_Label ShL = TopLabels.Value(i);
    Handle(TDataStd_TreeNode) Node;
    if( ShL.FindAttribute(XCAFDoc::MaterialRefGUID(),Node) && Node->HasFather() ) {
      // find PDS for current shape
      TopoDS_Shape aShape = XCAFDoc_ShapeTool::GetShape(ShL);
      TopLoc_Location Loc;
      TColStd_SequenceOfTransient seqRI;
      Standard_Integer nb =  FindEntities( FP, aShape, Loc, seqRI );
      if(seqRI.Length()<=0) continue;
      Handle(StepRepr_ProductDefinitionShape) PDS;
      Handle(StepRepr_RepresentationContext) RC;
      Handle(Standard_Transient) ent = seqRI.Value(1);
      FindPDSforRI(aGraph,ent,PDS,RC);
      if(PDS.IsNull()) continue;
      // write material entities
      TDF_Label MatL = Node->Father()->Label();
      Handle(TCollection_HAsciiString) aName;
      Handle(TCollection_HAsciiString) aDescription;
      Standard_Real aDensity;
      Handle(TCollection_HAsciiString) aDensName;
      Handle(TCollection_HAsciiString) aDensValType;
      Handle(StepRepr_Representation) RepDRI = new StepRepr_Representation;
      Handle(StepRepr_Representation) RepMRI = new StepRepr_Representation;
      if(MatTool->GetMaterial(MatL,aName,aDescription,aDensity,aDensName,aDensValType)) {
        if(aName->Length()==0) continue;
        TCollection_AsciiString aKey(aName->ToCString());
        if(MapDRI.IsBound(aKey)) {
          RepDRI = Handle(StepRepr_Representation)::DownCast(MapDRI.Find(aKey));
          if(MapMRI.IsBound(aKey)) {
            RepMRI = Handle(StepRepr_Representation)::DownCast(MapMRI.Find(aKey));
          }
        }
        else {
          // write DRI
          Handle(StepRepr_DescriptiveRepresentationItem) DRI = new StepRepr_DescriptiveRepresentationItem;
          DRI->Init(aName,aDescription);
          Handle(StepRepr_HArray1OfRepresentationItem) HARI = new StepRepr_HArray1OfRepresentationItem(1,1);
          HARI->SetValue(1,DRI);
          RepDRI->Init(new TCollection_HAsciiString("material name"),HARI,RC);
          Model->AddWithRefs(RepDRI);
          // write MRI
          if(aDensity>0) {
            // mass
            Handle(StepBasic_SiUnitAndMassUnit) SMU = new StepBasic_SiUnitAndMassUnit;
            SMU->SetName(StepBasic_sunGram);
            Handle(StepBasic_DerivedUnitElement) DUE1 = new StepBasic_DerivedUnitElement;
            DUE1->Init(SMU,3.0);
            // length
            Handle(StepBasic_SiUnitAndLengthUnit) SLU = new StepBasic_SiUnitAndLengthUnit;
            SLU->Init(Standard_True,StepBasic_spCenti,StepBasic_sunMetre);
            Handle(StepBasic_DerivedUnitElement) DUE2 = new StepBasic_DerivedUnitElement;
            DUE2->Init(SLU,2.0);
            // other
            Handle(StepBasic_HArray1OfDerivedUnitElement) HADUE = new StepBasic_HArray1OfDerivedUnitElement(1,2);
            HADUE->SetValue(1,DUE1);
            HADUE->SetValue(2,DUE2);
            Handle(StepBasic_DerivedUnit) DU = new StepBasic_DerivedUnit;
            DU->Init(HADUE);
            Model->AddWithRefs(DU);
            StepBasic_Unit aUnit;
            aUnit.SetValue(DU);
            Handle(StepBasic_MeasureValueMember) MVM = new StepBasic_MeasureValueMember;
            MVM->SetName(aDensValType->ToCString());
            MVM->SetReal(aDensity);
            Handle(StepRepr_MeasureRepresentationItem) MRI = new StepRepr_MeasureRepresentationItem;
            MRI->Init(aDensName,MVM,aUnit);
            HARI = new StepRepr_HArray1OfRepresentationItem(1,1);
            HARI->SetValue(1,MRI);
            RepMRI->Init(new TCollection_HAsciiString("density"),HARI,RC);
            Model->AddWithRefs(RepMRI);
          }
          //WriteNewMaterial(Model,aName,aDescription,aDensity,aDensName,aDensValType,RC,RepDRI,RepMRI);
          MapDRI.Bind(aKey,RepDRI);
          if(!RepMRI.IsNull()) MapMRI.Bind(aKey,RepMRI);
        }
      }
      // write chain PDS---(DRI,MRI)
      StepRepr_CharacterizedDefinition CD1;
      CD1.SetValue(PDS);
      Handle(StepRepr_PropertyDefinition) PropD1 = new StepRepr_PropertyDefinition;
      PropD1->Init(new TCollection_HAsciiString("material property"),Standard_True,
                   new TCollection_HAsciiString("material name"),CD1);
      Model->AddWithRefs(PropD1);
      StepRepr_RepresentedDefinition RD1;
      RD1.SetValue(PropD1);
      Handle(StepRepr_PropertyDefinitionRepresentation) PDR1 =
        new StepRepr_PropertyDefinitionRepresentation;
      PDR1->Init(RD1,RepDRI);
      Model->AddWithRefs(PDR1);
      StepRepr_CharacterizedDefinition CD2;
      CD2.SetValue(PDS);
      Handle(StepRepr_PropertyDefinition) PropD2 = new StepRepr_PropertyDefinition;
      PropD2->Init(new TCollection_HAsciiString("material property"),Standard_True,
                   new TCollection_HAsciiString("density"),CD2);
      Model->AddWithRefs(PropD2);
      StepRepr_RepresentedDefinition RD2;
      RD2.SetValue(PropD2);
      Handle(StepRepr_PropertyDefinitionRepresentation) PDR2 =
        new StepRepr_PropertyDefinitionRepresentation;
      PDR2->Init(RD2,RepMRI);
      Model->AddWithRefs(PDR2);
    }
  }

  return Standard_True;
}


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

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


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

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


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

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


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

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


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

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


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

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


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

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


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

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


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

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


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

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


//=======================================================================
//function : SetDimTolMode
//purpose  : 
//=======================================================================

void STEPCAFControl_Writer::SetDimTolMode(const Standard_Boolean dimtolmode)
{
  myDGTMode = dimtolmode;
}


//=======================================================================
//function : GetDimTolMode
//purpose  : 
//=======================================================================

Standard_Boolean STEPCAFControl_Writer::GetDimTolMode() const
{
  return myDGTMode;
}


//=======================================================================
//function : SetMaterialMode
//purpose  : 
//=======================================================================

void STEPCAFControl_Writer::SetMaterialMode(const Standard_Boolean matmode)
{
  myMatMode = matmode;
}


//=======================================================================
//function : GetMaterialMode
//purpose  : 
//=======================================================================

Standard_Boolean STEPCAFControl_Writer::GetMaterialMode() const
{
  return myMatMode;
}
