code: public java.lang.String getRev() {
          return (java.lang.String) getStateHelper().eval(PropertyKeys.rev);
  
      }
docs: <p>Return the value of the <code>rev</code> property.</p>
  <p>Contents: A reverse link from the anchor specified
  by this hyperlink to the current document.
  The value of this attribute is a space-separated
  list of link types.