Green Building XML is an XML-based schema for transferring data from digital building models to simulation programs. It is primarily used to transfer model data with reduced geometry. It is predominantly used in the fields of building services and building physics simulation, and less frequently as an interface to structural analysis programs.
For more information, visit www.gbxml.org. You can also find a list of programs that support the gbXML format here: www.gbxml.org/Software_Tools_that_Support_GreenBuildingXML_gbXM