[IfcDocumentInformationRelationship.RelationshipType property 关系类型 public IfcLabel RelationshipType { get; set; } 也可以看看 class IfcLabel class IfcDocumentInformationRelationship 命名空间 Aspose.CAD.FileFormats.Ifc.IFC2X3.Entities 部件 Aspose.CAD]
