code: def requestRowRange(self, rangeBegin, rangeEnd):
          
          return self.constructRows(self.performQuery(rangeBegin, rangeEnd))
docs: Retrieve display data for the given range of rows.
  
          @type rangeBegin: C{int}
          @param rangeBegin: The index of the first row to retrieve.
  
          @type rangeEnd: C{int}
          @param rangeEnd: The index of the last row to retrieve.
  
          @return: A C{list} of C{dict}s giving row data.