public static function build( $urls )
	{
		$set	= new XML_DOM_Node( "urlset" );
		$set->setAttribute( 'xmlns', "http://www.google.com/schemas/sitemap/0.84" );
		foreach( $urls as $url )
		{
			$node	= new XML_DOM_Node( "url" );
			$child	= new XML_DOM_Node( "loc", $url );
			$node->addChild( $child );
			$set->addChild( $node );
		}
		$xb	= new XML_DOM_Builder();
		return $xb->build( $set );
	}