enum IFCGenericSubElements { PSetRevitInternalStart = 1536, PSetRevitInternalEnd = PSetRevitInternalStart+255, PSetRevitInternalRelStart = PSetRevitInternalEnd+1, PSetRevitInternalRelEnd = PSetRevitInternalRelStart+255, SplitInstanceStart = 2049, SplitInstanceEnd = SplitInstanceStart+255, SplitTypeStart = SplitInstanceEnd+1, SplitTypeEnd = SplitTypeStart+255 };