26.2.2.1 Choosing how to use paragraph formats for WAI markup
To add WAI markup using paragraph formats, you must apply a different paragraph format to the content of each cell that needs a particular combination of WAI markup, in each table. You can apply the unique format to the visible content of the cell; or you can apply it to extra text in the cell, use property Delete to prevent the additional text from appearing in the HTML output, and apply a condition to hide the extra text in print versions. See §25.1.2 Using paragraph formats for WAI attributes for more information.
A paragraph format to which you assign a WAI attribute can be anywhere in the cell, and does not have to be the only paragraph format used in that cell.
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