We looked at IFC GUIDs a couple of times already, e.g. to discuss the relationship between UniqueId, DWF and IFC GUID, the ExportUtils.GetExportId method, and the IFC GUID representation algorithm. The Revit 2012 API introduced the ExporterIFCUtils class for customizing IFC export, and the IFC exporter was released as open source. In Revit 2013, the IFC export implementation switched to a more generic toolkit, many of the APIs introduced in Revit 2012 were removed and replaced, and new interfaces introduced...
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