If the UIData component has a "header" facet, or any of the child UIColumn components has a "header" facet, render a "thead" element. If the UIData component has a "header" facet, encode its contents inside of "tr" and "th" elements, respectively. Output the value of the "headerClass" attribute of the UIData component, if present, as the value of the "class" attribute on the "th". Output the number of child UIColumn components of theUIData component as the value of the "colspan" attribute on the "th". Output "colgroup" as the value of the "scope" attribute on the "th" element.
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