title: How do you format keywords in Microdata for a CreativeWork?
body: <p>I'm working with Microdata and I want to use Schema.org’s <code>keywords</code> for <code>CreativeWork</code>. </p>
  
  <p>The schema specifies that it should be text but do I put each keyword in a separate element with <code>itemprop="keywords"</code> or do I put them all in one <code>keywords</code> element? If I put them all in one element do I use commas as a separator?</p>