The entrytbl DocBook element used for allowing the nesting of a table within a table cell will not work with FrameMaker. Therefore, in order to maintain portability for those authors/editors who use FrameMaker, either (1) eliminate the use of the entrytbl element or (2) comment your documentation thoroughly so that those who normally otherwise use FrameMaker are made aware of its use.

The other element for entering an element into a table cell--entry--can be used to insert just about any type of component in a cell other than another table element.