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IFC(Industry Foundation Classes) is a class library for the building model data exchanging.
IFCs enable interoperability among AEC/FM software applications and this means the end useres
in AEC/FM area can share the model data by IFCs. IFCs are written by EXPRESS of STEP.
The classes in IFC specification are defined by IAI(International Alliance for Interoperability). IAI released IFC Release2.0 in April 1999 and wonderful CD-ROM including whole documents and specifications about IFC Release2.0.
Please see also: IAI International
IFC R2.0 Object Hierarchy Chart [PDF format]
This chart is included in IFC Release2.0 CD-ROM for IAI members.