Microformat proposal

Has a microformat been proposed around "Questions and Answers".

I think it would be good to mark a question and the corresponding answer in

<span class=qa><span class=question>Where does paul kinlan live?</span><span class=answer>liverpool</span></span>

It could help solve some semantic meaning to what part of text is a question and what is the anwser.

For instance I get a lot of searches coming to my site with queries such as "How do I...", "What does...". I could set up a "search engine" that parses pages with this micro format in and indexes question and answer pairs rather than whole text pages.

Is this a good idea? Is it worth progressing? Has it already been discussed?