Re: [xml-dev] Validation - a history.

> Did DTD's grow up with SGML or were they added?

They predated the S being added to SGML.

http://www.sgmlsource.com/history/roots.htm


  The DCF GML User's Guide (IBM SH20-9160), which I wrote in 1978,
  includes the first published formal document type "descriptions"
  (DTDs),   

  .....



and of course the notion of a formal grammar against which a language
could be parsed is a lot older than that.


David