There is some great stuff on the transition of DTDs to optional status
(and Charles G's fight against it) in Jon Bosak's closing keynote for XML
2006: http://2006.xmlconference.org/proceedings/162/presentation.html

Bob


On Thu, March 1, 2007 4:58 am, David Carlisle wrote:
>
>> 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
>
>
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