Default namespaced xml and xpath

default-namespaced.xml

<?xml version="1.0"?>
<bookstore xmlns="urn:xmlns:25hoursaday-com:bookstore">
 <book> 
    <title>Lord of the Rings</title> 
    <author>J.R.R. Tolkien</author>
 </book> 
</bookstore>

namespaced.xml

<?xml version="1.0"?>
<bk:bookstore xmlns:bk="urn:xmlns:25hoursaday-com:bookstore">
 <bk:book> 
    <bk:title>Lord of the Rings</bk:title> 
    <bk:author>J.R.R. Tolkien</bk:author>
 </bk:book> 
</bk:bookstore>

xpath.php

<?php
  $xml = simplexml_load_file('namespaced.xml');
	$result = $xml->xpath('/bk:bookstore/bk:book/bk:title');
	echo $result[0];

	echo "<br />";

	$xml = simplexml_load_file('default-namespaced.xml');
	$result_from_default_namespace = $xml->xpath("/*[local-name()='bookstore']/*[local-name()='book']/*[local-name()='title']");
	echo $result_from_default_namespace[0];
?>