code: public function queryChangeset($param)
  	{
  		// Set the API base
  		$base = 'changesets/' . $param;
  
  		// Build the request path.
  		$path = $this->getOption('api.url') . $base;
  
  		// Send the request.
  		$xmlString = $this->sendRequest($path);
  
  		return $xmlString->osm;
  	}
docs: Method to query on changesets
  
  @param   string  $param  Parameters for query
  
  @return  array  The XML response
  
  @since   1.0