title: 'itemListElement' not recognized in 'HowTo' schema
body: <p>Based on the Microdata example in <a href="http://schema.org/HowTo" rel="nofollow noreferrer">http://schema.org/HowTo</a> and extrapolating syntax from the Microdata vs RDFa example in <a href="http://schema.org/hasOfferCatalog" rel="nofollow noreferrer">http://schema.org/hasOfferCatalog</a> (there seem to be so few actual examples of RDFa to find?), I put together something like so:</p>
  
  <pre class="lang-html prettyprint-override"><code>&lt;main vocab="http://schema.org/" typeof="HowTo"&gt;
    &lt;h1&gt;&lt;span property="name"&gt;How to do the Hokey Pokey&lt;/span&gt;&lt;/h1&gt;
    &lt;ol property="steps"&gt;
      &lt;li property="itemListElement" typeof="HowToStep"&gt;
        &lt;img alt="step 1" src="step1.jpg" align="left"&gt;
        &lt;p property="itemListElement" typeof="HowToDirection"&gt;
          put your left hand in&lt;/p&gt;&lt;/li&gt;
      &lt;li property="itemListElement" typeof="HowToStep"&gt;
        &lt;img alt="step 2" src="step2.jpg" align="left"&gt;
        &lt;p property="itemListElement" typeof="HowToDirection"&gt;
          put your left hand out&lt;/p&gt;&lt;/li&gt;
  </code></pre>
  
  <p>But, when put into <a href="https://search.google.com/structured-data/testing-tool/u/0/" rel="nofollow noreferrer">Google's Structured Data Testing Tool</a>, I get:</p>
  
  <blockquote>
    <p>The property <code>itemListElement</code> is not recognized by Google for an object of type <code>HowTo</code>.</p>
  </blockquote>
  
  <p><a href="https://webmaster.yandex.com/tools/microtest/" rel="nofollow noreferrer">Yandex's validator</a> also says:</p>
  
  <blockquote>
    <p>WARNING: <a href="http://schema.org/itemListElement" rel="nofollow noreferrer">http://schema.org/itemListElement</a> field not specified in <a href="http://schema.org/HowTo" rel="nofollow noreferrer">http://schema.org/HowTo</a></p>
  </blockquote>
  
  <p>What am I doing wrong?</p>