lass" attribute of the <code>UIData</code>
            component, if
            present, as the value of the "class" attribute on the "th".
            Output the number of child <code>UIColumn</code>
            components of the
            <code>UIData</code> component as the value of the
            "colspan"
            attribute on the "th". Output "colgroup" as the value of the
            "scope" attribute on the "th" element. </p>
            <p>If any of the child <code>UIColumn</code>
          