title: Microdata itemprop causes W3C validator error
body: <p>After adding Microdata to my pages, I got many errors from W3C validator complaining the <code>itemprop</code>:</p>
  
  <blockquote>
    <p>there is no attribute "<code>itemprop</code>"</p>
  </blockquote>
  
  <p>From code like this:</p>
  
  <pre><code>&lt;p itemprop="description"&gt;...&lt;/p&gt;
  </code></pre>
  
  <p>This is my DOCTYPE and <code>html</code> tag</p>
  
  <pre><code>&lt;!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" 
   "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"&gt;
  
  &lt;html xmlns="http://www.w3.org/1999/xhtml" 
  xmlns:fb="http://www.facebook.com/2008/fbml"&gt;
  </code></pre>
  
  <p>How to fix the validator errors?</p>
  
  <p>p.s. Previously I have the validator error for <code>itemscope</code> as well. But after I changed it to <code>itemscope="itemscope"</code> then the error is fixed.</p>