code: public void getRelationComplete(long id, MapDataHandler handler)
  	{
  		boolean authenticate = osm.getOAuth() != null;
  		osm.makeRequest(RELATION + "/" + id + "/" + FULL, authenticate, new MapDataParser(handler, factory));
  	}
docs: Queries the relation with the given id plus all it's members and all nodes of ways that are
  members of the relation.<br>
  If not logged in, the Changeset for each returned element will be null
  
  @param id the way's id
  @param handler map data handler that is fed the map data
  
  @throws OsmNotFoundException if the relation with the given id does not exist