& XSLT Thanks, that does look much closer to what we need. Looks like the namespace 
declarations can be filtered out with a simple s/<reg-exp> //g operation, for 
our purposes we won't be worried about name space collisions. Attribute 
order siginificance is a problem. In fact, in our special case, we're not 
even interested in element order. So we might end up somehow sorting src and 
dst documents (xsl?) and feeding the sorted two to XML::DifferenceMarkup.

Or it might turn out easiest to implement our own small utility.

Regards,
Yishay


> From: Vaclav Barta <vbar@[...].cz>
> To: "Yishay Weiss" <yishayjobs@[...].com>, 
> perl-xml@[...].com
> Subject: Re: is there a way to check if one xml document is contained in 
> another?
> Date: Fri, 16 Sep 2005 16:12:14 +0100
> 
> 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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