How to use microformats

Question

I'm trying to add some microformats to my site and testing with google Structured Data Testing Tool is giving me a

Warning: Itemtype not recognized.

What would be the right syntax to get it through?

<div class="vote-message" itemscope itemtype="http://data-vocabulary.org/Rating">
  <span itemprop="value">
    <span itemprop="bestRating">
      5.0/<strong>5</strong>
    </span>
    Bewertung (<span itemprop="ratingValue">3</span> Stimmen)
  </span>
</div>

Answer 1

because http://data-vocabulary.org has been shuttered and replaced with http://schema.org/; if you replace your itemtype attribute's value to itemtype="http://schema.org/AggregateRating", the warning goes away, and you can see the extracted structured data in the structured data tool.