That's what the MemoryIndex in Lucene's contrib/ does.  I tested it with a very 
fast incoming document stream (live blog posts from around the planet) and it 
held up well in my limited testing.

Otis
--
Sematext -- http://sematext.com/ -- Lucene - Solr - Nutch

----- Original Message ----
From: Mark Miller <[EMAIL PROTECTED]>
To: java-user@lucene.apache.org
Sent: Thursday, January 17, 2008 7:57:38 AM
Subject: Re: Inverted search / Search on profilenet

Verity, autonomy, whatever, has a what they call a reverse query system
 
called profilenet. A profile is just a query (or I guess more than one 
query?) and you can setup a bunch of them. Then you supply the document
 
and you will get the matching queries as well as a score. They say its 
the opposite of doing a search with a query and getting back docs. 
Instead you do a search with a doc and get back these queries. They 
claim it can be used for things like taxonomy/classification among
 other 
things. I don't know how true this is to a real reverse query system as
 
that would seem to be kind of slow -- my guess is its a bit of an 
approximation.

- Mark

Endre Stølsvik wrote:
>
> May I ask: What IS a profilenet? I ask since this obviously is 
> something that you two hit off on right away, while I haven't heard
 of..!
>
>
> Thanks,
> Endre.
>
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