You are overcomplicating the problem. Do not use setDocumentElement, it creates a new root element. The constructor of XPathContext takes a context node as a parameter, not a file. This is a Short, Self Contained, Correct Example:
#!/usr/bin/perl
use warnings;
use strict;
use XML::LibXML;
my $dom = XML::LibXML->load_xml(string => << '__XML__');
<Article> <!-- fixed typo -->
<Main>
<Sect>
<H4>Include</H4>
.....
<P1> This is the criteria</P1>
<L>
<LI>
<LI_Label>1.</LI_Label>
<LI_Title>Critera 1</LI_Title>
</LI>
<LI>
<LI_Label>2.</LI_Label>
<LI_Title>Critera 2</LI_Title>
</LI>
<LI>
<LI_Label>3.</LI_Label>
<LI_Title>Critera 3</LI_Title>
</LI>
<LI>
<LI_Label>4.</LI_Label>
<LI_Title>Critera 3</LI_Title>
</LI>
</L> <!-- fixed missing closing tag -->
</Sect>
</Main>
</Article>
__XML__
my $xc = XML::LibXML::XPathContext->new;
my $count = $xc->findvalue('count(//Article//Sect//LI)', $dom);
print "$count list nodes found.\n" if $count;
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Are you posting in the right place? Check out Where do I post X? to know for sure.
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Posts may use any of the Perl Monks Approved HTML tags. Currently these include the following:
<code> <a> <b> <big>
<blockquote> <br /> <dd>
<dl> <dt> <em> <font>
<h1> <h2> <h3> <h4>
<h5> <h6> <hr /> <i>
<li> <nbsp> <ol> <p>
<small> <strike> <strong>
<sub> <sup> <table>
<td> <th> <tr> <tt>
<u> <ul>
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Snippets of code should be wrapped in
<code> tags not
<pre> tags. In fact, <pre>
tags should generally be avoided. If they must
be used, extreme care should be
taken to ensure that their contents do not
have long lines (<70 chars), in order to prevent
horizontal scrolling (and possible janitor
intervention).
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Want more info? How to link
or How to display code and escape characters
are good places to start.
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