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

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

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

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

		$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->diffResult;
	}