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<parent_node>
<node1><child_node>stuff_I_can_get</child_node></node1>
<node2><child_node_a>stuff_I_want_1</child_node_a></node2>
<node2><child_node_a>stuff_I_want_2</child_node_a></node2>
</parent_node>

foreach $test($dom->findnodes('/parent_node'))
{
    $mystring = $test->findnodes('./node2/child_node_a');
}