Building Energy Modeling (BEM)
From Wiki.OSArch
Introduction
There is currently 2 BIM format related to energy modeling : gbXML and IFC (using IfcRelSpaceBoundary2ndLevel) Most energy analysis software reads gbXML. Some read IFC. Generating geometry for gbXML and IfcRelSpaceBoundary is quite similar. Information contained in both format is different.
[Add a gbXML vs IFC features comparison]