XML::XSH2 is just a wrapper around XML::LibXML. I'd be surprised if it didn't work the same. And indeed, the following doesn't print the id of the div that uses the &atad; class: 
#!/usr/bin/perl
use warnings;
use strict;
use feature qw{ say };

use XML::LibXML;

my $dom = 'XML::LibXML'->load_xml(location => '1.xml', load_ext_dtd =>
+ 0);
my $xpc = 'XML::LibXML::XPathContext'->new;
$xpc->registerNs(xh => 'http://www.w3.org/1999/xhtml');
for my $div ($xpc->findnodes('//xh:div[@class="data"]', $dom)) {
    print $div->{id}, "\n"
}

[download]

Interestingly, at the same time the following shows the classes of all the divs as data: 

for my $div ($xpc->findnodes('//xh:div', $dom)) {
    print join ' ', @{ $div }{qw{ id class }}, "\n"
}

[download]

Bugreport anyone?

($q=q:Sq=~/;[c](.)(.)/;chr(-||-|5+lengthSq)`"S|oS2"`map{chr |+ord
}map{substrSq`S_+|`|}3E|-|`7**2-3:)=~y+S|`+$1,++print+eval$q,q,a,

[download]

In reply to Re^3: Parsing HTML/XML with Regular Expressions by choroba
in thread Parsing HTML/XML with Regular Expressions by haukex

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