XPath with Html (Xml-Vala)

void main ()
{
    var doc = new Html.Doc ();
    doc.load_uri ("http://www.youtube.com/results?search_query=otep", Xml.ParseOptions.CheckHtmlUtags);
    var xpath = new Xml.XPath (doc.root_node);
    xpath.eval ("//link[@rel='stylesheet']");
    foreach (var node in xpath.result)
        print ("%s\n *** \n", node.dump (0));
}