Compare:

<section>
My name is Igor but people call me Fritz. My home page is  
<a href="http://www.igorrocks.com">www.igorrocks.com</a>.
I live in Darmstadt, Germany and I am the Senior Medical Assistant for Frankenstein Inc.
</section>

to:

<section vocab="http://schema.org/" typeof="Person">
  My name is <span property="name">Igor</span>, 
  but people call me <span property="nickname">Fritz</span>.
  My home page is 
  <a href="http://www.igorrocks.com" rel="url">www.igorrocks.com</a>.
  I live in Darmstadt, Germany and I am the <span property="title">Senior Medical Assistant</span>
  for <span property="affiliation">Frankenstein Inc</span>.
</section>