Description:
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When creating a namespaced DOMDocument programmatically (appendChild, etc), I cannot get DOMXPath to return the same results on the same underlying XML document as I can when use DOMDocument->loadXML() to populate the documents XML.

I compiled and tested the latest PHP 5.3.4RC2-dev (cli) (built: Nov 23 2010 21:51:46) using --with-dom and --with-xml and used the latest stable libxml2-devel.x86_64 2.7.7-2.fc14 from fedora 14 and the problem still persists.

Sorry its like 25 lines of code with comments, I don't have somewhere else to put them.

Test script:
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//Constructing the DOMDocument from XML string allows DOMXPath to work
$xml = <<<EOT
<?xml version="1.0" encoding="UTF-8"?>
<entry xmlns="http://www.w3.org/2005/Atom" xmlns:other="http://other.w3.org/other"><id>uYG7-sPwjFg</id><published>2009-05-17T18:29:31.000Z</published></entry>
EOT;
$doc = new DOMDocument;
$doc->loadXML($xml);
$xpath = new DOMXPath($doc);
$xpath->registerNamespace('atom', "http://www.w3.org/2005/Atom");
$entries = $xpath->evaluate('//atom:entry/atom:published/text()');
///prints 2009-05-17T18:29:31.000Z as expected
print $entries->item(0)->nodeValue ;

//Constructing the same exact document programmatically causes DOMXPath to not work
$doc = new DOMDocument("1.0", "UTF-8");
$entry = $doc->createElement('entry');
$doc->appendChild($entry);
$entry->setAttribute('xmlns', "http://www.w3.org/2005/Atom");
$entry->setAttribute('xmlns:other', "http://other.w3.org/other");
$id = $entry->appendChild($doc->createElement('id'));;
$id->appendChild($doc->createTextNode("uYG7-sPwjFg"));
$published = $entry->appendChild($doc->createElement('published'));
$published->appendChild($doc->createTextNode("2009-05-17T18:29:31.000Z"));

$xpath = new DOMXPath($doc);
$xpath->registerNamespace('atom', "http://www.w3.org/2005/Atom");
$entries = $xpath->evaluate('//atom:entry/atom:published/text()');
//throws error as node is not found
print $entries->item(0)->nodeValue;

Expected result:
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I would expect both of the above examples to print 2009-05-17T18:29:31.000Z

Actual result:
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Example one prints 2009-05-17T18:29:31.000Z and example 2 fails because the node is not found by Xpath