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From: Eli Zaretskii <eliz@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: Indexed search with grep-like output
Date: Sun, 02 Jan 2011 06:07:34 +0200
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> From: Lennart Borgman <lennart.borgman@gmail.com>
> Date: Sun, 2 Jan 2011 00:03:46 +0100
> Cc: emacs-devel@gnu.org
> 
> Does id-util.el allow you to restrict your query to a directory tree?

Yes: you need to index each such tree separately.  `lid', the command
that queries the data base, accepts a file name of an index as its
command-line argument (and its Emacs front-end accepts that as well).