strategy for identifying DTD/schema artifacts

Wow! Thanks for all the information!

I created a wiki page for "best practices", so maybe it will be helpful
as new SCs come on board:
http://wiki.oasis-open.org/dita/BestPractices#preview

I've captured your suggestions in a section called "DTD/schema
development" and provided a link to the email thread, should we wish to
review the wisdom that led to our conclusion.

-seth