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use strict;
use warnings;
...
for my $elt ($root->look_down ('_tag' => 'a', 'attr' => '2')) {
    print $elt->as_XML (), "\n";
}

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All the 'a' elements
<a attr="1">Contents of a - 1</a>
...

All the 'a' elements with attr='2'
<a attr="2">Contents of a - 2</a>