26.2.1.1 Defining blocks of header cells

You can specify that a row- or column-header cell should apply not just to the cells in its immediate row or column, but to a larger group: a block of cells, possibly including other row- or column-header cells. How the group property works depends on whether you are using the scope method or the id/headers method to associate body cells with header cells.

For example, if you use scope="colgroup" in a column-header cell along with ColGroupElements=Yes, the table columns to which the header cell applies are all those in its own <colgroup> element. If you use id/headers instead, the setting for ColGroupElements does not matter; Mif2Go does the work of making matching id and headers identifiers. They do the very same job as scope+ColGroupElements; the same associations are made from header cells to body cells.

See §27.5 Using ColGroup and RowGroup cells for more information.

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