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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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