public function __construct($accessKey, $userId, $password)
{
$this->userId = $userId;
$this->accessRequest = new Dom(Dom::XML);
$this->rateRequest = new Dom(Dom::XML);
$access = new Child('AccessRequest');
$access->setAttributes('xml:lang', 'en-US');
$key = new Child('AccessLicenseNumber', $accessKey);
$id = new Child('UserId', $userId);
$pwd = new Child('Password', $password);
$access->addChild($key)->addChild($id)->addChild($pwd);
$this->accessRequest->addChild($access);
}