pls help...parsing xml

[shotokan99]

i have this situation:

i was given a query string : http://mywebservice.co m?url=<xurl>
where
xurl=is a valid url. now what the query string does it will display
an
xml on the page. like this one:


<?xml version="1.0" encoding="UTF-8" ?>
<response...>
..
..
..
</response>

now i made a script that looks like this:
$xmyurl='http://myurl.com?xxxx= xxxx;
$ch=curl_init() ;
curl_setopt($ch ,CURLOPT_URL,$x myurl);
curl_setopt($ch , CURLOPT_RETURNT RANSFER,1);
$xresult=curl_e xec($ch);
curl_close($ch) ;

$xml = new SimpleXMLElemen t($xresult);
echo $xml->url[0]->localUrl;

when i tried to run, nothing is being displayed...wha t could have gone
wrong?