Решено! - Звёзды рейтинга в Google - не отображаются. Ошибка в плагине голосования - Поисковая оптимизация, продвижение сайтов на Joomla (SEO)

			$html .= '<div class="content_rating" itemprop="aggregateRating" itemscope itemtype="http://schema.org/AggregateRating">';
			$html .= '<p class="unseen element-invisible">'
					. JText::sprintf('PLG_VOTE_USER_RATING', '<span itemprop="ratingValue">' . $rating . '</span>', '<span itemprop="bestRating">5</span>')
					. '<meta itemprop="ratingCount" content="' . (int) $row->rating_count . '" />'
					. '<meta itemprop="worstRating" content="0" />'
					. '</p>';
			$html .= $img;
			$html .= '</div>';

			$html .= '<div class="content_rating" itemprop="aggregateRating" itemscope itemtype="http://schema.org/AggregateRating">';
			$html .= '<p class="unseen element-invisible">'
					. JText::sprintf('PLG_VOTE_USER_RATING', '<span itemprop="ratingValue">' . $rating . '</span>', '<span itemprop="bestRating">5</span>')
					. '<span itemprop="ratingCount" content="' . (int) $row->rating_count . '">' . (int) $row->rating_count . '</span>'
					. '<span itemprop="worstRating" content="0">0</span>'
					. '<span itemprop="name">' . $row->title . '</span>'
					. '</p>';
			$html .= $img;
			$html .= '</div>';

$html .= '<div class="row"><div class="col-xs-12 col-sm-3 col-md-3 col-lg-3 content-rating" itemprop="aggregateRating" itemscope itemtype="http://schema.org/WebPage">'
		. '<meta itemprop="name" content="' . $row->title . '" />';
$html .= '<div itemprop="aggregateRating" itemscope itemtype="http://schema.org/AggregateRating" class="mark-rating">'
		. JText::sprintf('PLG_VOTE_USER_RATING', '<span itemprop="ratingValue">' . $rating . '</span>', '<span itemprop="bestRating">5</span>', '<meta itemprop="ratingValue" content="' . $rating . '" />', '<meta itemprop="bestRating" content="5" />')

		. '<meta itemprop="ratingCount" content="' . (int) $row->rating_count . '" />'
		. '<meta itemprop="worstRating" content="1" />'
		. '</div>';
$html .= $img;
$html .= '</div>';

// Generate voting form
$html .= '<form method="post" action="' . htmlspecialchars($uri->toString(), ENT_COMPAT, 'UTF-8'). '" class="form-inline">';
$html .= '<span class="col-xs-12 col-sm-4 col-md-4 col-lg-4 content-vote">';
$html .= '<label class="unseen element-invisible" for="content_vote_' . $row->id . '">' . JText::_('PLG_VOTE_LABEL'). '</label>';
$html .= JHtml::_('select.genericlist', $options, 'user_rating', null, 'value', 'text', '5', 'content_vote_' . $row->id);
$html .= ' <input class="btn btn-mini" type="submit" name="submit_vote" value="' . JText::_('PLG_VOTE_RATE'). '" />';
$html .= '<input type="hidden" name="task" value="article.vote" />';
$html .= '<input type="hidden" name="hitcount" value="0" />';
$html .= '<input type="hidden" name="url" value="' . htmlspecialchars($uri->toString(), ENT_COMPAT, 'UTF-8'). '" />';
$html .= JHtml::_('form.token');
$html .= '</span>';
$html .= '</form></div>';