XML-Data: advantages over DTD syntax?

Paul Madsen paul_madsen at qmail.newbridge.com
Mon Sep 29 16:11:21 BST 1997

                                          9:31 AM             29/09/97

Hi, I posted this to comp.text.sgml but didn't get much response (thanks J.R.)

The XML-Data specification from Microsoft
(http://www.sil.org/sgml/xml-data9706223.htm) proposes
that the logic traditionally expressed in the DTD (content models, attribute
lists, entity definitions,
etc.) be expressed using the syntax of XML instances instead. 

For instance, instead of the DTD element declaration 

<!ELEMENT book - - (p+) > 

the XML-Data scheme rule would be something like 

<elementType id="book"> 
     <elt href="#p" occurs="PLUS"/> 

I'm attracted to the the idea if only because it seems "cool". 

But what does this gain us? What deficiencies with the DTD formalism does it

Is it the ability to extend object types so that one class of object is a
specialization of another more
general class? 

Do not Architectural forms provide the traditional DTD syntax just that

Thanks for any insight. 


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