Help required for remove_child function

[paragpdoke]

Hello everyone.
I'm new to PHP and I'm trying to get some XML manipulation working. Somehow I can't get the remove_child method to work for me. Here are the details:

XML structure:

<?xml version="1.0"?>
<?xml-stylesheet type='text/xsl' href='myXSL.xsl'?>
<ServerList>
    <Server id="myServer1">
        <!--Some tags here. These tags have no children-->
        <Tag1>AAA1</Tag1>
        <Tag2>BBB2</Tag2>
        <TagN>ZZZ3</TagN>
    </Server>
    <Server id="myServer2">
        <!--Some tags here. These tags have no children-->
        <Tag1>AAA4</Tag1>
        <Tag2>BBB5</Tag2>
        <TagN>ZZZ6</TagN>
    </Server>
</ServerList>
 

I'm trying to capture some _REQUEST variables and create a new server node in the XML DOM. Before this, I query the DOM using xpath and the server id. If the server is found, I intend to delete that node and rest of the php code (creation of the new server node) follows suitably.

PHP code excerpt:

$dom=new DOMDocument();
$dom->load("myXML.xml");
$myXpath=new Domxpath($dom);
//$ServerID is populated correctly based on _REQUEST variables.
$myQuery="/ServerList/Server[@id='".$ServerID."']";
$result=$myXpath->query($myQuery);
if (($result->length) == 1) {
    //What follows is line # L
    $dom->document_element->remove_child($result->item(0));
}
//Some more code...probably irrelevant at this moment.
 

The error I'm observing is:

Fatal error:  Call to a member function remove_child() on a non-object in myPHP.php on line L.
 

I'm sure there is something wrong in my php code. Can someone kindly take a look and help me out ?
Thank you in advance,
Parag P. Doke

[paragpdoke]

The page at:
http://www.php.net/manual/en/function.domdocument-document-element.php
has a comment saying "documentElement" should be used in PHP 5 rather than "document_element". With that change, I'm running into a new error with PHP 5.2.5.

How to use the remove_child method if it belongs to a DOMNode and not a DOMElement ? Or rather, how to convert output of DOMDocument->documentElement to type DOMNode so that the remove_child method is supported ?

Thanks in advance again,
Parag P. Doke