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Should we be able to tag answers?

On some of our communities, it would be helpful to be able to label answers systematically:

- On Code Golf, by language.

- On Software Development, Power Users, or Linux Systems, by specific version/platform/library -- for example, if the answer to a C++ question is different for C++11 than C++14, or a browser answer is different for Firefox and Chrome, or a front-end question is different for pure Javascript or jQuery.

In some cases perhaps the question should be more specific, but it seems like in some cases it'd be better to have the answers all together.  And, of course, on Code Golf, varied answer languages are expected.

It's sometimes useful to be able to *just tell at a glance* what an answer applies to.  There are probably people still using (or maintaining code in) Java 7, so you don't want to nuke those answers, but you want the person who's looking for a current solution to a Java problem to be able to tell at a glance that this answer is for an older version.

Would it make sense to be able to add tags to *answers*, in addition to the tags on the *question*?  

In addition to making answer scoping more visible, answer tags could support *sorting*.  I'm imagining another sort option at the top of the answers alongside "Score" and Activity", and maybe also showing answer tags in the table of contents.  I'm also imagining that this would be something communities would opt into, since it doesn't make sense on every community.

I think tag hierarchies are orthogonal; while (if they exist, which I haven't checked) C++11 and C++14 should be children of C++, a challenge on Code Golf doesn't have any question-level language tags at all.