public function expandBBoxChangeset($id, $nodes)
	{
		$token = $this->oauth->getToken();

		// Set parameters.
		$parameters = array(
			'oauth_token' => $token['key'],
		);

		// Set the API base
		$base = 'changeset/' . $id . '/expand_bbox';

		// Build the request path.
		$path = $this->getOption('api.url') . $base;

		// Create a list of tags to update changeset
		$nodeList = '';

		if (!empty($nodes))
		{
			foreach ($nodes as $node)
			{
				$nodeList .= '<node lat="' . $node[0] . '" lon="' . $node[1] . '"/>';
			}
		}

		$xml = '<?xml version="1.0" encoding="UTF-8"?>
				<osm version="0.6" generator="JoomlaOpenStreetMap">
				<changeset>'
				. $nodeList .
				'</changeset>
			</osm>';

		$header['Content-Type'] = 'text/xml';

		// Send the request.
		$response = $this->oauth->oauthRequest($path, 'POST', $parameters, $xml, $header);

		$xmlString = simplexml_load_string($response->body);

		return $xmlString->changeset;
	}