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

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The only justification I can give for learning DTDs now that other schema technologies exist is so that you are familiar with them when they come up in conversation, books or during application development. Also as mentioned earlier, their more esoteric features are typically not used in many application development scenarios.

	-----Original Message----- 
	From: tariq abdur-rahim [mailto:ecliptoid330@yahoo.com] 
	Sent: Thu 5/23/2002 9:36 AM 
	To: clbullar@ingr.com 
	Cc: xml-dev@lists.xml.org 
	Subject: RE: [xml-dev] DTDs, W3C Schemas, RELAX NG, Schematron?

	Interesting point!  However, would the argument now,
	not be that, given the realative "weakness" of DTDs in
	comparison to Schemas, RELAX NG, and Schematron, what
	would the purpose be of even going the DTD route for
	validation?  Too, given the example stated...
	"Say you want to design a new parts language.
	You will want to validate your design.  Once
	done, someone using it probably doesn't want
	to do that.  You can start from DTDs, or you
	can start higher up from XML Schema.  How
	much validation do you need?  For example,
	Schemas will do more than DTDs, but not as
	much as Schemas plus Schematron.  You
	can do it all with Schematron, but that
	could be painful."
	...(a) "...Schemas will do more than DTDs, but not as
	much as Schemas plus Schematron...", why bother with
	DTDs at all?  (b) Since, "DTDs aren't as strong as XML
	Schema or RELAX NG for validation..." and "...you
	might still need schematron or a means to enforce
	business rules...", again i must ask why DTDs - now.
	Back when it was first introduced is understandable,
	but with the advent of the aforementioned
	technologies, i am left with a feeling of "why?"
	regarding the DTD approach.
	With that in mind, is there a bottom-line sans the
	"based upon situation" recourse?
	--- "Bullard, Claude L (Len)" <clbullar@ingr.com>
	> Don't overlook RELAX RNG.  Despite it's status
	> vis a vis the W3C, I think it has a future as
	> the "easier to do and easier to explain" schema
	> language with a little less than XSD and a
	> bit more than DTDs.
	> len
	> From: tariq abdur-rahim
	> [mailto:ecliptoid330@yahoo.com]
	> Thanks a lot betty, len, and michael.  The input and
	> advice is very informative and most definately
	> appreciated.  i guess in a nutshell, DTDs still
	> carry
	> a certain significance and an amount of usefulness,
	> but the Schema+Schematron combination is a
	> 'stronger'
	> approach to take in XML application development.
	> len, i will definately check out the resources that
	> you suggested.
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