code: def listReleaseVersions(self, release_version="", dataset='', logical_file_name=''):
          
          if dataset and ('%' in dataset or '*' in dataset):
              dbsExceptionHandler('dbsException-invalid-input',
                  " DBSReleaseVersion/listReleaseVersions. No wildcards are" +
                  " allowed in dataset.\n.")
  
          if logical_file_name and ('%' in logical_file_name or '*' in logical_file_name):
              dbsExceptionHandler('dbsException-invalid-input',
                  " DBSReleaseVersion/listReleaseVersions. No wildcards are" +
                  " allowed in logical_file_name.\n.")
  
          conn = self.dbi.connection()
          try:
              plist = self.releaseVersion.execute(conn, release_version.upper(), dataset, logical_file_name)
              result = [{}]
              if plist:
                  t = []
                  for i in plist:
                      for k, v in i.iteritems():
                          t.append(v)
                  result[0]['release_version'] = t
              return result
          finally:
              if conn:
                  conn.close()
docs: List release versions