Namespace Xbim.Ifc2x3.ExternalReferenceResource Classes IfcClassification IfcClassificationItem IfcClassificationItemRelationship IfcClassificationNotation IfcClassificationNotationFacet IfcClassificationReference IfcDocumentElectronicFormat IfcDocumentInformation IfcDocumentInformationRelationship IfcDocumentReference IfcExternalReference IfcLibraryInformation IfcLibraryReference Interfaces IfcClassificationNotationSelect IfcDocumentSelect IfcLibrarySelect Enums IfcDocumentConfidentialityEnum IfcDocumentElectronicFormat.IfcDocumentElectronicFormatClause IfcDocumentReference.IfcDocumentReferenceClause IfcDocumentStatusEnum IfcExternalReference.IfcExternalReferenceClause