I can see the code and data samples, but I was not able to understand what exactly you are trying to achieve. For example, the following script processes both the input files (enhanced by the namespace declarations). I do not see any issue with the namespace - what exactly do you want to do with the elements in the dc namespace? 
#!/usr/bin/perl
use warnings;
use strict;

use XML::LibXML;

my $xpc = 'XML::LibXML::XPathContext'->new;
$xpc->registerNs(x  => 'http://checklists.nist.gov/xccdf/1.1');
$xpc->registerNs(dc => 'http://purl.org/dc/elements/1.1');

for my $file (glob '*.xml') {
    print "# $file:\n";
    my $string;
    my $xml = 'XML::LibXML'->load_xml(location => $file);
    $string .= $_ for $xpc->findnodes('/x:Group/x:Rule/x:check/x:check
+-content/text()',
                                      $xml->documentElement);
    print "$string\n";
}

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In reply to Re^5: LibXML Namespace issue by choroba
in thread LibXML Namespace issue by ohm.kazhbu

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