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From: Eli Zaretskii <eliz@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: Null filename ("") is considered to correspond to an existing, 
	readable, and writable file?
Date: Tue, 03 Jan 2006 21:16:08 +0200
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References: <DNEMKBNJBGPAOPIJOOICMEAPDBAA.drew.adams@oracle.com>
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> From: "Drew Adams" <drew.adams@oracle.com>
> Date: Tue, 3 Jan 2006 10:51:20 -0800
> 
> Those general design goals are fine, but they
> don't speak specifically to the advantage of _this_ particular design. They
> don't, for example, show an advantage over considering "" to not be a file
> name (neither relative nor absolute).

One advantage, IMO, is that no error is thrown or signaled for "",
which means application code will not need to cope with these
exceptional situations.