This is what you should use to get all custom information out
of this element. This is used by service filter functions to
determine whether a service element contains specific tags,
etc. NOTE: this only considers elements which are direct
children of the element for this object.
$list An array of elements with the specified
name which are direct children of the element. The
nodes returned by this function can be passed to $this->parser
methods (see {@link Auth_Yadis_XMLParser}).