Type objectIds by typeId through IfcRelDefinesByType. existing is every
IfcRelDefinesByType in the model (see readRelatedLists): the type's own
relationship is extended rather than duplicated, and an object typed by a
different type is detached from it first, since an occurrence has at most
one type.
Type
objectIdsbytypeIdthrough IfcRelDefinesByType.existingis every IfcRelDefinesByType in the model (seereadRelatedLists): the type's own relationship is extended rather than duplicated, and an object typed by a different type is detached from it first, since an occurrence has at most one type.