RE: [xml-dev] RE: Compelling use case for XML Catalogs?

["David Lee" <dlee@calldei.com>]

Interesting question, but I fail to see the issue.
What would be the use of an XML Catalog that "handled" unknown or unexpected
URL's ?
What would be the expected behavior (besides "not found") for a URL which
was not registered in the catalog ?


----------------------------------------
David A. Lee
dlee@calldei.com
http://www.xmlsh.org

-----Original Message-----
From: Costello, Roger L. [mailto:costello@mitre.org] 
Sent: Monday, June 13, 2011 11:25 AM
To: xml-dev@lists.xml.org
Subject: RE: [xml-dev] RE: Compelling use case for XML Catalogs?


John Cowan responded to my post:

> Does XML Catalog have the ability to express this:
>>
>>[snip various conditional things]
>>
>> No, of course not.  Catalogs can only express one thing: when you
>> see this URI, use this other URI instead.  (And ditto for public
>> identifiers.)

The inability of XML Catalog to check for the presence of correct URLs seems
like a significant limitation.

XML Catalog only works if: 

    - you have pre-knowledge of exactly what URLs will
      be present in the XML (XSLT, XSD, RNG, SVG, etc.) 
      documents that you receive/process

     - the XML documents will always contain the correct 
       URL; there will never be any accidental or malicious
       alteration of URLs

Yes?

/Roger


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