title: Source for wm_concat
body: <p>I've been assigned to a new project, that uses Oracle Database 11g Express Edition Release 11.2.0.2.0 - 64bit Production. Inside the project most 'sql' statements make heavy use of the unsupported function wm_concat. It seems like the wm_concat is only available in the commercial version.</p>
  
  <p>Does anyone have the source to wm_concat so that I can use it with the Express version?</p>