The defacto standards for geometric data are driven by the dominate commercial software packages, e.g. ESRI's formats for geospatial information or AutoDesk's DXF for Orthogonal data [ and here I am lumping CAD and GIS under the scope of any universal standard ].
The issue with creating a standard is that to a first approximation every CAD or GIS program creates and operates on a unique set of meta-data...this is what gives each piece of software it's distinguishing features [ sure there are possible algorithmic efficiencies, but these are not an issue that a data interchange standard ought to treat as a primary concern ].
The wonderful thing about standards for 3d data is that there are so many to choose from. [1] There have been massive projects to create standards, and many of them have completed their work, only to see time march on. In AEC, the National Cad Standard was created in the 1980's [2]. It still locks the 3d description of designs to their 2d representation as drawings. The Army Corps of Engineers implements NCS. Their document is 450 pages [3]. To be comprehensible by humans, it is based on the idea:
CAD levels or layers are analogous to
overlays in manual drafting systems
and serve to separate graphic elements
(lines, shapes, and text) according
to the design discipline they represent.
Why, because unlike a computer program, the artifact it describes cannot be assumed to be directly manifested in meat-space without human involvement...e.g. buildings require construction crews and machine parts require someone pour raw material into the hopper and put finished goods on a truck, transport them, unload and install them for their next use...a design for a kitchen renovation doesn't compile into a new cabinet configuration.
So the fundamental issue for developing creating a useful 3d data model is not a document, but a way of creating the data model that is attractive to people who create 3d data models. The prototype is JavaScript not ADA.
[1] With perhaps disputed apologies to Grace Hopper. http://en.wikiquote.org/wiki/Grace_Hopper#Disputed
[2] http://www.nationalcadstandard.org/ncs6/about.php
[3] http://www.saj.usace.army.mil/Portals/44/docs/Engineering/AE...