Разметка хлебных крошек через RDF

<?php $listed = array(); ?>
<span xmlns:v="http://rdf.data-vocabulary.org/#">
<ul>
<li class="home">
<span typeof="v:Breadcrumb"><a href="<?php echo $options['home_url']; ?>" title="<?php echo LANG_HOME; ?>" rel="v:url" property="v:title">Главная</a></span>
</li>
<?php if ($breadcrumbs) { ?>
<li class="sep"></li>
<?php foreach($breadcrumbs as $id=>$item){ ?>
<?php if (in_array($item['href'], $listed)){ continue; } ?>
<li>
<?php if (!isset($item['is_last'])){ ?>
<span typeof="v:Breadcrumb"><a href="<?php echo $item['href']; ?>" rel="v:url" property="v:title"><span><?php html($item['title']); ?></span></a></span>
<?php } else { ?>
<span typeof="v:Breadcrumb"> <a rel="v:url" property="v:title"><span><?php html($item['title']); ?></span></a></span>
<?php } ?>
</li>
<?php if ($id < sizeof($breadcrumbs)-1){ ?>
<li class="sep"></li>
<?php } ?>
<?php $listed[] = $item['href']; ?>
<?php } ?>
<?php } ?>
</ul>
</span>