private function parseURLValue()
{
$bUseUrl = $this->comes('url', true);
if ($bUseUrl) {
$this->consume('url');
$this->consumeWhiteSpace();
$this->consume('(');
}
$this->consumeWhiteSpace();
$oResult = new URL($this->parseStringValue());
if ($bUseUrl) {
$this->consumeWhiteSpace();
$this->consume(')');
}
return $oResult;
}