code: public void errOnHorizontalOverlap(Cell laterCell) throws SAXException {
          if (!((laterCell.right <= left) || (right <= laterCell.left))) {
              this.err("Table cell is overlapped by later table cell.");
              laterCell.err("Table cell overlaps an earlier table cell.");
          }
      }
docs: Emit errors if this cell and the argument overlap horizontally.
  @param laterCell another cell
  @throws SAXException if the <code>ErrorHandler</code> throws