advice 1) perlquote + xpather.pl

advice 2) line up your xpaths by / and study the xpather full paths :) like this 

#!/usr/bin/perl --
use strict; use warnings;
use XML::LibXML;

my $dom = XML::LibXML->new(
    qw/ recover 2 /
)->load_xml(
    location => 'pm1082058.xml',
);
for my $matrix ( $dom->findnodes( q{  //matrix/vm[@type='br']  } )) {
    print $matrix->nodePath, "\n";
    print "\n$matrix\n\n";
#~     for my $version ( $matrix->findnodes('./vm/release/@version') )
+{
    for my $version ( $matrix->findnodes('./release/@version') ){
        print $version->nodePath, "\n";
        print "$version\n";
    }
    print "\n\n";
}
__END__
/formation/block/matrix[1]/vm[2]

<vm type="br">
        <release version="7.2.2">
        </release>
      </vm>

/formation/block/matrix[1]/vm[2]/release/@version
 version="7.2.2"


/formation/block/matrix[2]/vm[2]

<vm type="br">
        <release version="7.2.1">
        </release>
      </vm>

/formation/block/matrix[2]/vm[2]/release/@version
 version="7.2.1"

[download]

As you can see vm doesn't have vm children 

//matrix/vm[@type='br']
                       ./vm/release

[download]

In reply to Re: xpath problem using XML::LibXML by Anonymous Monk
in thread xpath problem using XML::LibXML by anadem

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post, it's "PerlMonks-approved HTML":


  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.