& XSLT Hi,

[shameless plug] For your example, XML::DifferenceMarkup (available on CPAN) 
produces

<?xml version="1.0"?> 
<dm:diff xmlns:dm="http://www.locus.cz/XML/DifferenceMarkup"> 
  <a> 
    <dm:insert xmlns:dm="http://www.locus.cz/XML/DifferenceMarkup"> 
      <b name="A"/> 
    </dm:insert> 
    <dm:copy xmlns:dm="http://www.locus.cz/XML/DifferenceMarkup" count="3"/> 
  </a> 
</dm:diff> 

Sorry about the redundant namespace declarations (removing them via 
XML::LibXML proved more painful than rewriting the code in C++), but you 
don't have to look at them: I'd consider the first input file to be a subset 
of the second one iff there's no dm:delete element in the output, which 
should be easy enough to test programatically... There might be pathological 
cases where that test gives a "wrong" answer, but I can't think of any right 
now - if you come across any, let me know.

	Bye
		Vasek


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