id_from_url (MusicBrainz::Client)

    /*
     * Extract the actual artist/album/track ID from a MBE_GetxxxxxId query.
     *
     * The MBE_GETxxxxxId queries return a URL where additional RDF metadata
     * for a given ID can be retrieved.  Callers may wish to extract only
     * the ID of an artist/album/track for reference.
     *
     * Aliases:
     *   MusicBrainz::Client#get_id_from_url
     *
     * Examples:
     *   # get the artist name of the first track on the album
     *   url = mb.result MusicBrainz::Query::AlbumGetArtistId, 1
     *   id = mb.id_from_url url
     *
     */
    static VALUE mb_client_id_from_url(VALUE self, VALUE url) {