code: public java.lang.String getRules() {
          return (java.lang.String) getStateHelper().eval(PropertyKeys.rules);
  
      }
docs: <p>Return the value of the <code>rules</code> property.</p>
  <p>Contents: Code specifying which rules will appear between cells
  within this table.  Valid values are:  none (no rules,
  default value); groups (between row groups); rows
  (between rows only); cols (between columns only); and
  all (between all rows and columns).