Q: DTD versioning

[Hans Carlsson]

Excuse me for blundering in to the exciting xml-dev discussions going
on...

I'm fairly new to XML, I have read some books, XML Complete by Seven
Holzner (a complete disaster), XML by Elliotte Rusty Harold (good
introduction). I'm not going to be a an XML tool developer, I guess I'm
going to be an XML practitioner. I confess I haven't read the W3 XML
spec.

Is it possible to have versions of XML DTDs? I'm wondering about the
'simple' issue of versioning for XML DTD's... How is this being
addressed by the XML spec (community), tools to be developed etc.?

Take for example an an INVOICE DTD. After a while someone in the
organization realizes that an INVOICE should contain a <PHONE> tag, or
that they should be printed on pink paper <PAPER COLOR="pink">. Do you
define a new DTD, <IMPROVED_INVOICE>, or do you add an attribute,
<INVOICE VERSION="2">?

Does the XML spec address this? or is it conferred to the realm of
application builders?



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