MetaMain::exec

public function exec()
{
	if ($this->execCustom())
	{
		return;
	}

	$title = htmlspecialcharsbx(Seo::processValue('title', $this->fields['TITLE']));
	$description = Seo::processValue('description', $this->fields['DESCRIPTION']);
	$keywords = Seo::processValue('keywords', $this->fields['KEYWORDS']);

	if ($title != '')
	{
		Manager::setPageTitle($title);
	}
	if ($description != '')
	{
		Manager::getApplication()->setPageProperty(
			'description',
			$description
		);
	}
	if ($keywords != '')
	{
		Manager::getApplication()->setPageProperty(
			'keywords',
			$keywords
		);
	}
}