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From: Eli Zaretskii <eliz@gnu.org>
Newsgroups: gmane.emacs.help
Subject: Re: Is there any possibility recursively by dir propagate Emacs
 settings like .dir-locals.el per dir?
Date: Wed, 29 Dec 2010 06:48:03 -0500
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In-reply-to: <ifdoej$ogs$1@dough.gmane.org> (message from Oleksandr Gavenko on
	Wed, 29 Dec 2010 00:30:36 +0200)
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> From: Oleksandr Gavenko <gavenkoa@gmail.com>
> Date: Wed, 29 Dec 2010 00:30:36 +0200
> 
> I) 1. visit to file
>    2. check for ./.dir-locals.el
>    3. if ./.dir-locals.el not found, check for ../.dir-locals.el
>    4. if ../.dir-locals.el not found, check for ../../.dir-locals.el
> ...
> 
> or
> 
> II) 1. visit to file
>    2. check for ./.dir-locals.el
>    3. check for ../.dir-locals.el
>    4. check for ../../.dir-locals.el
> ...
> 
> I like II) variant.

Emacs uses I).  See locate-dominating-file.

> If I) right how deep .dir-locals.el can include upper .dir-locals.el?

I don't think you can.