title: eclipselink jpa operator details
body: <p>I am using 2.4.1 eclipse link and oracle. 
  <a href="http://eclipse.org/eclipselink/documentation/2.4/jpa/extensions/j_operator.htm#operator" rel="nofollow">This document</a> lists several operator, which can be used while writing queries. There is one example as well. I want to use dateDifference function. Where can I find the details of the parameters to be passed while using these operator.
  Some example code will be great.</p>