getElementById in PHP5

Hi,

I am working on PHP5 and all the xmldom related extensions are
installed and on properly.
I am trying to execute following code but some how not working.


$doc = new DomDocument();
$doc->validateOnParse = true;
$doc->load('abc.xml');
//xml file contains one element with this id
$elem = $doc->getElementById( 'eee' );

if(is_null($elem)) {
echo "<br>IT IS NULL";
}
else {
echo "<br>NOT NULL.";
}

The output shows me null every time...
Why is that?????

Thanks in advance
Manan Vyas

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