Description:
------------
I'm running latest PHP 5.2.9.1 on Win XP machine with apache 2.0 on it

I have 1GB free RAM (of 2GB)

here's the issue, I load huge xml file (8MB) that has namespace defined in it and try query with xpath, it ends with timeout error

strangely, when I move namespace definition out, it works. 
also, if I reduce filesize to say 1KB it also works (with namespace defined)

summary:

- Doesn't work when xml has a namespace defined and filesize is huge (~8MB tested)

- Works when filesize is tiny and has a namespace.
- Works when filesize is huge and no namespace defined.


Reproduce code:
---------------
test.xml
------------------
<?xml version="1.0" encoding="UTF-8"?>
<urlset xmlns="http://www.google.com/schemas/sitemap/0.84">
<url>
<loc>..</loc>
</url>
<url>
<loc>..</loc>
</url>
<url>
<loc>..</loc>
</url>
</urlset>


test.php
------------------
<?php
ini_set('display_errors', true);
ini_set('error_reporting', E_ALL);

$dom     = DomDocument::load('test.xml');
$xpath   = new DomXPath($dom);
$ns    = '';
if ($dom->documentElement && $dom->documentElement->namespaceURI)
{
  $xpath->registerNamespace('ns', $dom->documentElement->namespaceURI);
  $ns    = 'ns:';
}

$locUrls  = $xpath->query("//{$ns}loc");
var_dump($locUrls);
?>

Expected result:
----------------
Nodelist object.

Actual result:
--------------
PHP timeout error.