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# Example in section 9.1.3 of RFC4918
my $txt1 = '<?xml version="1.0" encoding="utf-8" ?>
...
       <propname/>
     </propfind>
';

#!/usr/bin/perl -w
use strict;
...
print "\$txt2 \$xpath6 \n";
&doitLX(\$txt2, $xpath6);

$txt1 $xpath1 
Failed XML::LibXML::Document::findnodes('/DAV:propfind/DAV:prop') $@ X
+Path error : Undefined namespace prefix
...
XML::LibXML::Document::findnodes('/propfind/propname') 0 nodes

XML::LibXML::Element::findnodes('/propfind/propname') 0 nodes

my $xpath1 = '/DAV:propfind/DAV:prop';
my $xpath2 = '/DAV:propfind/DAV:propname';