last(), number position(), number count(node-set), number id(obj), number local-name(node-set = self::node()), string namespace-uri(node-set = self::node()), string name(node-set = self::node()), string string(object = self::node()), string concat(string, string, string*), string starts-with(string, string), boolean contains(string, string), boolean substring-before(string, string), string substri