Bentley Systems has just released a white paper on using gbXML with BIM. The white paper provides specific recommendations to ensure that users obtain high-quality gbXML output from their BIM tools. It also provides specific guidance for Bentley BIM products (Building Designer and Speedikon).

A link to the white paper can be found under Related Information on the left side of this web page: http://www.bentley.com/en-US/Products/AECOsim+Energy+Simulator/