After over 6 years of development and over 1100 issues being resolved, on 12. March 2013 buildingSMART international has finally released the new generation of IFC schemas - IFC4. It will now be the basis of future work of establishing new open BIM enabled work flows by defining new IFC4 based model view definitions. The official IFC4 release includes both the IFC4 EXPRESS schema to support current STEP-based IFC exchanges, and the ifcXML4 XSD schema to support new simple ifcXML transactions.
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