XML trade off 1 - DTD vs XML Schema

DuCharme, Robert DuCharmR at moodys.com
Fri Jul 16 19:25:38 BST 1999

Ben Hui wrote:

>do you really think XML Schema is a
>master over DTD? 

The W3C Schema proposal is an in-progress moving target. In pursuit of
its goal of improving on XML 1.0 DTDs, the one public draft available so
far specifies many new features, and the design of these features is
bound to change as the spec evolves toward Recommendation status. XML
1.0 DTD syntax is a stable standard that, considering its roots in SGML,
has been used and implemented for years, and that is a huge advantage.

>Anything XML Schema just doesn't do right?

Discussion of these issues is what drives the revisions that will happen
between now and Recommendation status. The archives of the public
discussion are at

>Besides, when XML Schema rules, will DTD be migrated to XML Schema

As far as I can tell, the W3C XML Schema proposal includes all the
features of XML 1.0 DTDs, so it should be possible to automate migration
of DTDs. Whether W3C XML Schemas completely replace XML 1.0 DTDs after
the Schema proposal becomes a Recommendation is a tougher question.

Bob DuCharme       www.snee.com/bob       <bob@  
snee.com>  see www.snee.com/bob/xmlann for "XML:
The Annotated Specification" from Prentice Hall.

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