Description:
------------
In an XML document, when an xmlns attribute is present, all child elements of that 
element are also considered to be in that namespace. 

When a DocumentFragment is created and the root element contains an xmlns 
attribute this is the behaviour currently displayed by PHP. 

However if a documentfragment is appended to an element already present in the DOM 
which contains an xmlns, the appended fragment appears to be assigned a default 
'null' namespace.

Test script:
---------------
Scenario 1:  xmlns is present in the fragment.


<?php

const BLAH_NS = 'http://blah.com/blah';

  $xml = '
<root>
    <foo>
        <bar />
    </foo>
</root>
';

$fragXML = '<content xmlns="'.BLAH_NS.'"><sneh>some</sneh><grah>here</grah><ul><li>one</li><li>two</li><li>three</li></ul></content>';


$doc = new DOMDocument('1.0','UTF-8');
$doc->formatOutput = true;
$doc->preserveWhiteSpace = false;

$doc->loadXML( $xml );

$xpath = new DOMXPath( $doc );
$barElement = $xpath->query( '//bar' )->item(0);

// create a new element with  xmlns="http://blah.com/blah" . The expectation is that
// every child of this node will be part of this namespace as per the section on default 
// name spaces http://www.w3schools.com/XML/xml_namespaces.asp

// create a new document Fragment
$DOMFragment = $doc->createDocumentFragment();
$DOMFragment->appendXML( $fragXML );


// Attach the fragment to the rest of the document
$barElement->appendChild( $DOMFragment );

// all good so far
echo $doc->saveXML();

// register the bar name space so we can perform a lookup
$xpath->registerNamespace('b', BLAH_NS);

echo "\n\n\n";
// this doesn't work 
$grahElement = $xpath->query( '//b:grah' )->item(0);
echo "Find //b:grah " .$grahElement->nodeValue."\n";


// this works 
$grahElement = $xpath->query( '//grah' )->item(0);
echo "Find //grah  ".$grahElement->nodeValue."\n";

?>

Scenario 2: The xmlns attribute is present on the element the fragment is attached to


<?php

const BLAH_NS = 'http://blah.com/blah';

  $xml = '
<root>
    <foo>
        <bar />
    </foo>
</root>
';

$fragXML = '<sneh>some</sneh><grah>here</grah><ul><li>one</li><li>two</li><li>three</li></ul>';


$doc = new DOMDocument('1.0','UTF-8');
$doc->formatOutput = true;
$doc->preserveWhiteSpace = false;

$doc->loadXML( $xml );

$xpath = new DOMXPath( $doc );
$barElement = $xpath->query( '//bar' )->item(0);

// create a new element with  xmlns="http://blah.com/blah" . The expectation is that
// every child of this node will be part of this namespace as per the section on default 
// name spaces http://www.w3schools.com/XML/xml_namespaces.asp

$contentElement = $doc->createElementNS( BLAH_NS, 'content' );
$barElement->appendChild( $contentElement );

// create a new document Fragment
$DOMFragment = $doc->createDocumentFragment();
$DOMFragment->appendXML( $fragXML );


// Attach the fragment to the rest of the document
$contentElement->appendChild( $DOMFragment );

// all good so far
echo $doc->saveXML();

// register the bar name space so we can perform a lookup
$xpath->registerNamespace('b', BLAH_NS);

echo "\n\n\n";
// this doesn't work 
$grahElement = $xpath->query( '//b:grah' )->item(0);
echo "Find //b:grah " .$grahElement->nodeValue."\n";


// this works 
$grahElement = $xpath->query( '//grah' )->item(0);
echo "Find //grah  ".$grahElement->nodeValue."\n";

?>

Expected result:
----------------
In both cases I would expect the output of:

Find //b:grah here
Find //grah  

Actual result:
--------------
Find //b:grah 
Find //grah  grahtest