On Wed, Feb 21, 2007 at 10:55:26AM +0000, Olly Betts wrote: > Yes, see docs/termprefixes.txt in the Omega documentation for details. I've just expanded the section on boolean prefixes somewhat, so the latest SVN version is a better read: http://svn.xapian.org/trunk/xapian-applications/omega/docs/termprefixes.txt?view=co Cheers, Olly