title: How to mark only product categories?
body: <p>How do I have to mark my website product categories? … only categories …</p>
  
  <p>Maybe with <code>category</code> from <code>Offer</code>?</p>
  
  <p>Something like:</p>
  
  <pre class="lang-html prettyprint-override"><code>&lt;div itemscope itemtype="http://schema.org/Offer"&gt;
     &lt;a itemprop="category" href="category1.php"&gt;My category 1&lt;/a&gt;
  &lt;/div&gt;
  </code></pre>