& XSLT Michael Nachbaur wrote:
>  my $parser = new XML::LibXML();
>  my $doc = $parser->parse_string($xmp);
>  # or:
>  # my $doc = $parser->parse_file($xmp_filename);
>  my $rootNode = $doc->documentElement();
>  my $image = $rootNode->findvalue('//xapgimg:image');
>  
>  Or if you want to be more specific, you can use the following for the 
>  last line:
>  my $image = 
>  $rootNode->findvalue('/x:xmpmeta/rdf:rdf//xap:thumbnails//xapgimg:image');
>  
>  This code assumes that only one thumbnail exists.  However, it should 
>  suffice.

Actually (I think), because there can be multiples, findnode returns
a list.  Unless findnode has specially coded it (which I doubt),
in a scalar context, it will return the number of nodes found, rather than
the node.  So, you'll do better with:

my ($firstimage) = $rootNode-> findvalue(..xpath...);

Incidentally, since the example is heavily using namespaces,
it will be safer to use a more convoluted xpath like:
  //*[local-name()='image' and namespace-url()='whatever']

You'll probably be happier in the long run install
XML::LibXML::XPathContext and then

my $xpcontext = XML::LibXML::XPathContext-> new();
$xpcontext-> registerNs('xapgimp','whatever');
my ($firstimage)-> findvalue("//xapgimp:image", $rootNode);

 
>  The above code illustrates using XPath to query the contents of the XML 
>  file.  You may want to look into XPath more, because it is a very 
>  powerful way of interacting with XML documents, and would let you get 
>  more out of this document easily if you need to.
>  
>  Christopher Pryce wrote:
>  
> > I'm not terribly good with XML yet, but I'm learning.
> >
> > How would I go about extracting the value of the <xampimg:image> tag 
> > in the following XML fragment, using XML::LibXML ?
> >
> > Thanks very much.
> >
> > -- 
> >
> >
> > <x:xmpmeta xmlns:x="adobe:ns:meta/" x:xmptk="XMP toolkit 2.9.1-13, 
> > framework 1.6">
> >     <rdf:rdf xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#" 
> > xmlns:ix="http://ns.adobe.com/iX/1.0/">
> >         <rdf:description xmlns:pdf="http://ns.adobe.com/pdf/1.3/" 
> > rdf:about="uuid:93ab74ca-923b-11d9-b281-0003934be352" 
> > pdf:producer="Adobe PDF library 6.66" />
> >         <rdf:description 
> > xmlns:photoshop="http://ns.adobe.com/photoshop/1.0/" 
> > rdf:about="uuid:93ab74ca-923b-11d9-b281-0003934be352" 
> > photoshop:datecreated="2005-03-11T00:00:00Z" 
> > photoshop:city="Minneapolis" photoshop:state="MN" 
> > photoshop:country="Hennepin" photoshop:credit="SRF Consulting Group, 
> > Inc." />
> >         <rdf:description xmlns:xap="http://ns.adobe.com/xap/1.0/" 
> > xmlns:xapgimg="http://ns.adobe.com/xap/1.0/g/img/" 
> > rdf:about="uuid:93ab74ca-923b-11d9-b281-0003934be352" 
> > xap:createdate="2005-03-11T08:14:14-06:00" 
> > xap:modifydate="2005-03-11T08:40:56-06:00" 
> > xap:creatortool="Illustrator" 
> > xap:metadatadate="2005-03-11T08:40:56-06:00">
> >             <xap:thumbnails>
> >                 <rdf:alt>
> >                     <rdf:li rdf:parsetype="Resource">
> >                         <xapgimg:format>
> >                             JPEG
> >                         </xapgimg:format>
> >                         <xapgimg:width>
> >                             244
> >                         </xapgimg:width>
> >                         <xapgimg:height>
> >                             256
> >                         </xapgimg:height>
> >                         <xapgimg:image>
> >                             #### Some Binary Data that I want. ########
> >                         </xapgimg:image>
> >                     </rdf:li>
> >                 </rdf:alt>
> >             </xap:thumbnails>
> >         </rdf:description>
> >         <rdf:description xmlns:xapmm="http://ns.adobe.com/xap/1.0/mm/" 
> > rdf:about="uuid:93ab74ca-923b-11d9-b281-0003934be352" 
> > xapmm:documentid="uuid:84758202-923b-11d9-b281-0003934be352" />
> >         <rdf:description xmlns:dc="http://purl.org/dc/elements/1.1/" 
> > rdf:about="uuid:93ab74ca-923b-11d9-b281-0003934be352" 
> > dc:format="application/vnd.adobe.illustrator">
> >             <dc:creator>
> >                 <rdf:seq>
> >                     <rdf:li>
> >                         Christopher Pryce
> >                     </rdf:li>
> >                 </rdf:seq>
> >             </dc:creator>
> >         </rdf:description>
> >     </rdf:rdf>
> > </x:xmpmeta>
> >
> > _______________________________________________
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> > Perl-XML@[...].com
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>  
>  
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-- 
bruce.miller@[...].gov
http://math.nist.gov/~BMiller/
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