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   RE: Are there still a lot of people using DTD rather than schema?

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  • From: "DuCharme, Robert" <Robert.DuCharme@moodys.com>
  • To: ",'xml-dev@lists.xml.org'" <xml-dev@lists.xml.org>
  • Date: Tue, 01 Aug 2000 09:23:49 -0400

Rick JELLIFFE wrote:

>If by "schema" you mean "W3C XML Schemas" then no-one in the world is
>using them, because they do not exist yet.  The features may change, the
>syntax may change, the rationale may change, the document texts may
>However, if by "schema" you mean the instance-syntax languages that are
>pre-cursors or alternatives to W3C XML Schemas, such as SOX, XDR, RELAX,
>DSD, etc. or to implementations of draft versions of W3C XML Schemas,
>then there are many people who are using them.

And to put these two together, everyone I know using any schema language has
stated an intention to convert to W3C Schemas when they're done, with the
net result that anyone using any kind of schema now, W3C or otherwise, will
have some conversion to do when the W3C Schema does become a Recommendation.
This conversion will be easiest for people now working with DTDs, because
automated tools should be easily available. (Extensibility's XML Authority
does it now, although I'm not sure which draft of the W3C Schema they
currently support.) 

One compelling reason to use schemas this early is that you're going to
process your documents using software that takes advantage of the extra
information that schemas let you store. If you've got such software waiting
to be used (whether from Biztalk or CommerceOne or whatever), great. If,
however, you were planning on writing the software yourself to process your
schema-driven documents, then now you have even more rewriting to do when
the W3C schemas reach Rec status. Plan ahead!

Bob DuCharme          www.snee.com/bob           <bob@  
snee.com>  "The elements be kind to thee, and make thy
spirits all of comfort!" Anthony and Cleopatra, III ii

P.S. the spellchecker in Microsoft's Outlook (used by corporate fiat, not by
my own choice) just suggested that when I referred to Microsoft's "Biztalk"
that perhaps I meant to write the word "Bestial."


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