RE: [xml-dev] Understanding XML catalogs: what they are, why theyare us

["Costello, Roger L." <costello@mitre.org>]

I wrote:

>> <?xml version="1.0"?>
>> <!DOCTYPE bookstore [
>>      <!ENTITY include-file SYSTEM "http://www.xfront.com/catalog-test/toUpperCase.xsl";>
>>      <!ENTITY import-file SYSTEM "http://www.xfront.com/catalog-test/toLowerCase.xsl";>
>> ]>
>> <xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform";
>>                  version="2.0">
>>
>>      <xsl:include href="&include-file;"/>
>>      <xsl:import href="&import-file;"/>"/>
>>

And David Carlisle responded:

> If you define an entity reference to an external parsed entity then 
> the replacement text of the entity is the content of the  file
> not the URL of the file so the xsl stylesheet referenced here is the
> one obtained by taking the content of the file toLowerCase.xsl 
> interpreted as a URL.

Oops!

Yes, quite right David.

So how are XML catalogs used? For example, can they be used with <xsl:include> elements? How would the above example be fixed?

/Roger