title: #root and #this in SpEL
body: <p>In Spring 3 SpEL, <code>#this</code> and <code>#root</code> were introduced.</p>
  
  <blockquote>
    <p>The variable #root is always defined and refers to the root context
    object. Although #this may vary as components of an expression are
    evaluated, #root always refers to the root.</p>
  </blockquote>
  
  <p>I have gone through the documentation, but I still don't understand what <code>#root</code> means (there is no example). Can someone please give me an example?</p>