Pop over to Revit ST and you will find a link to a white paper from Authors
Simon Taylor FRICS– Principal, Questant Inc., Project Controls and Risk Advisory Services
Christopher Bailey FRICS – Vice President, Chief Cost Planner, Lend Lease, New York
The introduction says
"A paper to introduce the concept of developing an industry standard coding structure for application to 3D design systems to create increased value from Building Information Modeling (BIM). It describes, by reference to the data that can be stored in the model, where the flow of data to ‘downstream’ management and analysis systems and databases is broken, and how the inclusion of standard coding will enable beneficial use of model information, and produce the value of BIM that is not currently available."
So a "thank you" to Glenn Jowett for finding this one