<tgroup>The <tgroup> element in a table contains the header and body
rows of a table.
See appendix for information about this element in OASIS document type shells.
- topic/tgroup
See table.
The following attributes are available on this element: Universal attribute group, outputclass, and the attribute
defined below. This element also uses @colsep, @rowsep, and
@align from Complex-table attribute group.
@cols
(REQUIRED)<tgroup>.