Get XML element node?

Hi there

How do I extract the value of a specific XML element node?
I am trying to extract the <description>value where the title = <title>AUD/USD</title>

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CODE
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# Load the XML file
$request_url = "localhost/test/rss.xml";
$xml = simplexml_load_file($request_url) or die("feed not loading");

# Access Attributes
??????????

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XML FILE
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<?xml version="1.0" encoding="utf-8"?>
<?xml-stylesheet type="text/css" href="../css/rss.css" ?>
<rss version="2.0">

<channel>
<title>Exchange Rates for United States Dollar</title>
<link>http://xe.com/USD/</link>
<description>The latest currency exchange rates for United States Dollar</description>
<lastBuildDate>Wed, 05 Nov 2008 21:25:10 GMT</lastBuildDate>
<language>en-us</language>
<copyright>Copyright: (C) The Money Converter, see http://xe.com/ </copyright>
<docs>http://xe.com/RSSFeeds.aspx</docs>
<ttl>15</ttl>
<image>
<title>The Money Converter Exchange Rates</title>
<url>http://xe.com/images/artwork/sml.jpg</url>
<link>http://xe.com/</link>
</image>

<item>
<title>AUD/USD</title>
<link>http://xe.com/USD/AUD.aspx</link>
<guid>http://xe.com/USD/AUD.aspx</guid>
<pubDate>Wed, 05 Nov 2008 21:25:10 GMT</pubDate>
<description>1 United States Dollar = 1.45996 Australian Dollar</description>
<category>Oceania</category>
</item>

<item>
<title>CAD/USD</title>
<link>http://xe.com/USD/CAD.aspx</link>
<guid>http://xe.com/USD/CAD.aspx</guid>
<pubDate>Wed, 05 Nov 2008 21:25:10 GMT</pubDate>
<description>1 United States Dollar = 1.16616 Canadian Dollar</description>
<category>North America</category>
</item>


Thank You

 

It would be something like this

$contents = file_get_contents("localhost/test/rss.xml");
$data = array();
$stuffs= array();
$inside  = "false";
$parser = xml_parser_create();

xml_parser_set_option($parser, XML_OPTION_CASE_FOLDING, 0);
xml_parser_set_option($parser, XML_OPTION_SKIP_WHITE, 1);
xml_parse_into_struct($parser, $contents, $data);
xml_parser_free($parser);

foreach($data as $datapoint) {
	
	if ($datapoint['tag'] == "item" && $datapoint['type'] == "open") {
		$stuff = new stuff();
		$inside = "true";
	}

	if ($datapoint['tag'] == "item" && $datapoint['type'] == "close") {
		if (!isset($stuffs[$stuff ->id])) {
			$stuffs[$stuff ->id]=$stuff ;
		}
		unset($stuff);	
		$inside  = "false";
	}
	
	if (isset($stuff) && isset($datapoint['value'])) {		
		if($datapoint['tag'] == "Title") 		$stuff ->title=$datapoint['value'];
		if($datapoint['tag'] == "Description") 	$stuff ->description=$datapoint['value'];
	}

}

class stuff
{
	var $title="";
	var $description="";
	
}

Code (markup):