/*
 * Extract an identifier fragment from a URL.
 *
 * Given a URI, this method will return the string that follows the #
 * separator (e.g. when passed
 * "http://musicbrainz.org/mm/mq-1.1#ArtistResult", this method will
 * return "ArtistResult").
 * 
 *
 * Aliases:
 *   MusicBrainz::Client#get_fragment_from_url
 *
 * Examples:
 *   # get the artist name of the first track on the album
 *   url = mb.result MusicBrainz::Query::AlbumGetArtistId, 1
 *   frag = mb.fragment_from_url url
 *   
 */
static VALUE mb_client_frag_from_url(VALUE self, VALUE url) {