Wie erhalte ich das Tag "<yweather: condition>" von Yahoo Weather RSS in PHP?

<?php $doc = new DOMDocument(); $doc->load('http://weather.yahooapis.com/forecastrss?p=VEXX0024&u=c'); $channel = $doc->getElementsByTagName("channel"); foreach($channel as $chnl) { $item = $chnl->getElementsByTagName("item"); foreach($item as ...