The element <colspec> (column specification) is used in the table group (<tgroup>) and can be overridden by the element <colspec> in the table header (<thead>), the table footer (<tfoot>) and the table body (<tbody>). When used in the table header, table footer and table body, the values specified override those that can be present on the table group and these values are in turn overridden by the settings of the same attributes on individual rows and entries.