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   RE: [xml-dev] DTDs, W3C Schemas, RELAX NG, Schematron?

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Are you developing 

1.  applications that use XML applications (for example, a parts catalog using 

2.  XML applications (for example, a new parts language)

3.  XML systems (for example, a faster parser, an XML native database)

For beginners:

1. Learn XML 1.0.  That includes DTDs.  This is the basis of XML. 
The support is there in almost all of the tools.  DTDs won't go 
away anytime soon if ever.  The support is there in the tools and they 
are out in the wild.  It is still a fast simple way to declare 
the application language. 

2. Learn RELAX NG and XML Schemas.  Schematron has no official 
standing, but without it, the weaknesses of RNG and XSD aren't 
easy to overcome.  Databases typically need the ability to 
specify co-occurrence constraints (if this value, then that 
value).  So one needs it.

3.  Learn XSLT.  That should probably be number two.

Don't rely on buzz.  Rely on your technical knowledge of 
your application/system requirements to pick the technologies. 
Buzz changes with the fashions.  Requirements stay reasonably 


-----Original Message-----
From: tariq abdur-rahim [mailto:ecliptoid330@yahoo.com]

Hey all:

W3C Schemas?

What - first off - is the *best* route to take from a
developer's stance?  Second, can these technologies
work in conjunction with one another, or must they be
implemented seperately in order to reap the (read any)
desired result(s)?

Also, where has all the buzz surrounding RELAX NG
gone?  It was not too long ago when it seemed to be a
very hot topic.  Finally, does anyone care to share
their opinion(s) on the future of DTDs?



T. A b d u r - R a h i m
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