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

[Stephen D Green <stephengreenubl@gmail.com>]

I think XML Catalogs would be more interesting if, besides binding

URLs to internal resources, they could bind namespaces to internal

resources. Still, there would be limitations which might be quite irksome

though, such as: Binding a namespace to a local schema might be

then be achievable, but what about stylesheets, etc? It would have to

be a lot more sophisticated to handle all the kinds of scenarios Roger

seems to be envisioning, such as all the uses of URLs with XML.

----

Stephen D Green

On 13 June 2011 16:28, David Lee <dlee@calldei.com> wrote:

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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