title: Google Custom Search sort attribute issue
body: <p>I am having problems using the sort attribute within my GCS request. Whenever I use sort targeting a PageMap element it returns with 0 results. Check it out below. Am I simply missing or misunderstanding something?</p>
  
  <p>Request Without Sort:
  <a href="http://www.google.com/cse?cx=010537259921960391009:s7pan_vavqu&amp;output=xml_no_dtd&amp;q=fire+more:pagemap:course" rel="nofollow">http://www.google.com/cse?cx=010537259921960391009:s7pan_vavqu&amp;output=xml_no_dtd&amp;q=fire+more:pagemap:course</a></p>
  
  <p>Request With Sort:
  <a href="http://www.google.com/cse?cx=010537259921960391009:s7pan_vavqu&amp;output=xml_no_dtd&amp;q=fire+more:pagemap:course&amp;sort=course-coursenumber:a" rel="nofollow">http://www.google.com/cse?cx=010537259921960391009:s7pan_vavqu&amp;output=xml_no_dtd&amp;q=fire+more:pagemap:course&amp;sort=course-coursenumber:a</a></p>