Hi, I am having problems about exporting gbXML file from Revit Architecture 2013. I have assighed materials for the windows, doors and walls in Revit 2013. After I export it as gbXML file, I find that in the gbXMl file, the doors and walls' materials are well delivered, while the materials for windows are not. I can not see the thermal and physical properties in gbXML. All what gbXML file has is "WindowType id="GSP4R"". My purpose is use the gbXML file to do energy analysis using Energy Plus, but since the windows' materials are missing, how could I do the energy performence analysis ?