protected function _prepareDocument()
{
$uri = clone JUri::getInstance();
$domain = $uri->toString(array('scheme', 'host', 'port'));
$canonicalLink = $domain . JRoute::_(JUDirectoryHelperRoute::getCategoriesRoute($this->category->id, true, $this->_layout), false);
JUDirectoryFrontHelper::setCanonical($canonicalLink);
$seoData = array("metatitle" => JText::_('COM_JUDIRECTORY_SEO_TITLE_CATEGORIES'), "metadescription" => "", "metakeyword" => "");
JUDirectoryFrontHelperSeo::seo($this, $seoData);
}