UPDATE: I broke down and rewrote my code using twig, it's *amazing*. Thanks for the suggestion and a special thanks for those who took the time to provide solutions. I can't seem to find out how to use XML::Xpath to change the value of priority on the includes in the xml below. I thought this would be simple, but I'm surprised at how stuck I seem to be getting. I'd strongly prefer using XML::XPath and not some other lib. 
<includes>
    <include>
        <priority>9990</priority>
        <required>true</required>
        <location>/efs/dist/tpcommon/itrstemplates/latest/common/templ
+ates/equities.xml</location>
    </include>
    <include disabled="true">
        <priority>10001</priority>
        <required>true</required>
        <location>/efs/dist/itrs/tools/latest/common/templates/global_
+authentication.xml</location>
    </include>
</includes>

[download]
-- Code snippet below - 

    my $path =  '//includes/include';
    my $nodes = $xp->find($path);
    for my $include ($nodes->get_nodelist) {
        my $priority = $xp->find('./priority', $include);
        my $location = $xp->find('./location', $include);
        print "Location = " . $location->string_value;
        print ", with Priority = " . $priority->string_value . "\n";
 
        ## I want to change this priority value to +1

[download]

In reply to Using XML::XPath to change values by paisani

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