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Where would you recommend that I put that information? 
 
Have you tried to index utf-8 with the Xapian indexer? If that 
works, then I'd be happy to say that if people wish to index utf-8 
then they can't use the built-in dbm indexer, but need to use 
the Xapian indexer. 
 
Having said that, I actually don't have a problem with just telling 
people they need to use one of the RDBMS backends. The dbm 
backend is really just for playing around, not serious work...