Logging version.bind queries only?

[gschmid at notes.cc.sunysb.edu]

What is the minimal amount of logging required to get version.bind queries
logged?

Is there any way to get this without turning on logging for all queries?

Is per-zone query logging possible?  i.e., can I set up a bogus .bind zone
with a 'version' chaos/txt record and log queries for that zone only?

I'd just like to know who's querying my ns for version info without the
overhead of logging *all* queries.

TIA