Good point; we'd definitely need a standard. Thankfully, [CommonMark][1] has been in development a while now, and features a complete, unambiguous spec, reference implementation, and test suite.
A little more work on that to get it to version 1.0 and we'd be golden.
A little more work on that to get it to version 1.0 and we'd be golden.
[1]: http://commonmark.org/