IFC ObjectType和IsTypedBy区别

比如一个beam,

ObjectType:

IsTypedBy:

 

 

The ObjectType attribute is used:

to store the user defined value for all subtypes of IfcObject, where a PredefinedType attribute is given, and its value is set to USERDEFINED.

to provide a type information (could be seen as a very lightweight classifier) of the subtype of IfcObject, if no PredefinedType attribute is given. This is often the case, if no comprehensive list of predefined types is available.

 

https://standards.buildingsmart.org/IFC/DEV/IFC4_3/RC1/HTML/schema/ifckernel/lexical/ifcobject.htm

 

IsTypedBy连接的IfcTypeObject里的type:

 

https://standards.buildingsmart.org/IFC/DEV/IFC4_3/RC1/HTML/schema/ifcsharedbldgelements/lexical/ifcbeamtypeenum.htm