I have downloaded the document 99-049.pdf from the www.opengis.org, and I'm preparing some specs for fmaps that will sort of follow these guidelines...
 
There are several points I don't like in the document: no 3D, no specs for object rendering (line width, color,..), no vertical datum, and limited list of available datums...
 
If you want to bring some input...
 
I should be back in front of my Linux box soon, so there will be some new commits in the CVS....
 
 
Cheers..
Franck