On the Subversion mailing list, such a two-dimensional scheme is used. To signal negative or positive opinion, you use the characters "-" and "+". Then you indicate wheterher the opinion is strong or weak with "1" or "0" respectively. So your points a and c correspond to "-1" and "+0". For the b case, I don't think they have a syntax. If you are that uninterrested, the natural thing to do is not to voice any opinion at all, and so no syntax is needed.
/ Marcus Comstedt (ACROSS) (Hail Ilpalazzo!)
Previous text:
2003-04-16 11:07: Subject: Pointers/lvalues
But opinion is not only one-dimensional. You must take into consideration how strong the opinion is as well.
strong opinion a ^ a) a strong negative opinion | b) doesn't carenegative | positive c) doesn't matter much, but positive ------+-------> | c | |b couldn't care less
/ Mirar