/*
 * Get the length of the RDF that was returned by the server of a MusicBrainz::Client object.
 *
 * Aliases:
 *   MusicBrainz::Client#get_rdf_len
 *   MusicBrainz::Client#result_rdf_len
 *   MusicBrainz::Client#get_result_rdf_len
 *   
 * Example:
 *   rdf_len = mb.rdf_len
 *
 */
static VALUE mb_client_rdf_len(VALUE self) {