(Many) XML Schema Questions

Len Bullard cbullard at hiwaay.net
Wed Dec 29 00:15:28 GMT 1999

Box, Don wrote:
> Also, see
> http://lists.w3.org/Archives/Public/www-xml-schema-comments/1999OctDec/0054.
> html for James Clark's comments on this attribute.

Thanks for the references, Don.

What James said.  The catalog is much cleaner to understand. The schema 
location attribute is 'ghastly'.

BTW:  If any of the XMLers are interested in a design situation where 
the basis of XML as a lexical design only is used and the application 
language (what some of you call an ML) is itself the basis for 
extensibility (contains its own self-describing means of extending 
it's namespace and element set), you should be following the 
X3D contributors design debate.  In X3D, they are assuming an 
object design from jump, so two different DTDs are being proposed.  
One maps directly to the node names of the VRML97 design; the 
other maps nodes and fields and hangs the names off of the 
attributes of same.   IOW, if you abandon the DOM, abandon the 
HTML browser, and think inside a standalone object framework, 
what do you design? This is XML MMTT in classic form because 
you can't use XML for validation of any real depth, why 
bother with it except to pick the shapes of the brackets?

[Note for a select group of elders:  they are 
at about meeting three of the MID work: which are the 
outermost objects and what are their names].

The design arguments should be of interest to those who wish to 
understand how XML and its lack of inline extensibility falls 
apart when designing object frameworks.  It is fascinating to read.  
Having sat through a decade of different teams trying to do this with 
markup starting with the IETM nodes and fields, talented and reasonable
keep trying the same solution and generally going away from 
the worlds of DTDs, schemas, architectural forms, etc.


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