title: What is an "include template" in Express/Jade?
body: <p><a href="http://www.hacksparrow.com/express-js-jade-partials-how-to-use-them.html" rel="nofollow">This article</a> seems to suggest that there such things as <code>include</code> templates. I've made the obvious Google searches but didn't find any documentation.</p>
  
  <p>What are they?</p>