> (5) I heard somewhere that the auto industry has agreed to exchange info
> using a standard DTD. Can anyone confirm this? Point me to the DTD?
The auto industry, through the SAE I believe, put together a standard
DTD for exchange of info required by the EPA about 10 years ago. The
DTD is, if I remember correctly, the J20001 DTD. It is an interesting
example of the kind of DTD taxonomy you describe because it models
systems and components, not service documents. You can find info about
it at Robin Cover's SGML bibliography (www.oasis-open.com/robin).