> I'd suggest that the structure here is
> really:
>
> <qa><qst>.....?</qst>
>     <ans><qa><qst>Did...that?</qst>
>              <ans>....</ans>
>          </qa>
>     </ans>
>
> </qa>

Semantically here, "Did I really say that?" is not a question at all.
Grammatically it's a rhetorical question, but in terms of markup it is
nothing more than the answer to the preceding question.  To denote THAT as a
<qst> would imply that we should denote ALL questions in ALL documents as
<qst>, when in fact semantically, questions often appear outside the scope
of a question/answer series.

If <dt> weren't restricted to inline content, definition lists would be
perfect for this application.  Each question could be a <dt> and each answer
a <dd>.