code: public function updateChangeset($id, $tags = array())
  	{
  		$token = $this->oauth->getToken();
  
  		// Set parameters.
  		$parameters = array(
  			'oauth_token' => $token['key'],
  		);
  
  		// Set the API base
  		$base = 'changeset/' . $id;
  
  		// Build the request path.
  		$path = $this->getOption('api.url') . $base;
  
  		// Create a list of tags to update changeset
  		$tagList = '';
  
  		if (!empty($tags))
  		{
  			foreach ($tags as $key => $value)
  			{
  				$tagList .= '<tag k="' . $key . '" v="' . $value . '"/>';
  			}
  		}
  
  		$xml = '<?xml version="1.0" encoding="UTF-8"?>
  				<osm version="0.6" generator="JoomlaOpenStreetMap">
  				<changeset>'
  				. $tagList .
  				'</changeset>
  				</osm>';
  
  		$header['Content-Type'] = 'text/xml';
  
  		// Send the request.
  		$response = $this->oauth->oauthRequest($path, 'PUT', $parameters, $xml, $header);
  
  		$xmlString = simplexml_load_string($response->body);
  
  		return $xmlString->changeset;
  	}
docs: Method to update a changeset
  
  @param   integer  $id    Identifier of the changeset
  @param   array    $tags  Array of tags to update
  
  @return  array  The XML response of updated changeset
  
  @since   1.0