code: public function multiFetchElements($element, $params)
  	{
  		if ($element != 'nodes' && $element != 'ways' && $element != 'relations')
  		{
  			throw new \DomainException('Element should be nodes, ways or relations');
  		}
  
  		// Get singular word
  		$singleElement = substr($element, 0, \strlen($element) - 1);
  
  		// Set the API base, $params is a string with comma seperated values
  		$base = $element . '?' . $element . '=' . $params;
  
  		// Build the request path.
  		$path = $this->getOption('api.url') . $base;
  
  		// Send the request.
  		$xmlString = $this->sendRequest($path);
  
  		return $xmlString->$singleElement;
  	}
docs: Method to get data about multiple ids of an element [node|way|relation]
  
  @param   string  $element  [nodes|ways|relations] - use plural word
  @param   string  $params   Comma separated list of ids belonging to type $element
  
  @return  array   The XML response
  
  @since   1.0
  @throws  \DomainException