code: public function updateElement($element, $xml, $id)
  	{
  		if ($element != 'node' && $element != 'way' && $element != 'relation')
  		{
  			throw new \DomainException('Element should be a node, a way or a relation');
  		}
  
  		$token = $this->oauth->getToken();
  
  		// Set parameters.
  		$parameters = array(
  			'oauth_token' => $token['key'],
  		);
  
  		// Set the API base
  		$base = $element . '/' . $id;
  
  		// Build the request path.
  		$path = $this->getOption('api.url') . $base;
  
  		$header['Content-Type'] = 'text/xml';
  
  		// Send the request.
  		$response = $this->oauth->oauthRequest($path, 'PUT', $parameters, $xml, $header);
  
  		return $response->body;
  	}
docs: Method to update an Element [node|way|relation]
  
  @param   string   $element  [node|way|relation]
  @param   string   $xml      Full reperentation of the element with a version number
  @param   integer  $id       Element identifier
  
  @return  array   The xml response
  
  @since   1.0
  @throws  \DomainException