DNS 'A' query for a single dot

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DNS 'A' query for a single dot
\ Mark (11 Mar 2008)
. \ Kevin Darcy (11 Mar 2008)
. \ Barry Margolin (11 Mar 2008)
. . \ Stephane Bortzmeyer (11 Mar 2008)
. . \ Chris Thompson (11 Mar 2008)
. . \ Justin Pryzby (13 Mar 2008)
. . \ Justin Pryzby (13 Mar 2008)
. \ Mark Andrews (11 Mar 2008)

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6 msg	Transferring of zones that use view.
9 msg	Bind9 - Reverse net /20 mask 255.255.240.0

Subject:	DNS 'A' query for a single dot
Group:	Bind-users
From:	Mark
Date:	11 Mar 2008

Hello ,

Does anybody knows what an "A" query for a dot (".") means?
Is it part of DNS and serve a special purpose?
Is it a bug on the client making the query?
Is it an indicative of a bot/worm making queries?

I am parsing the DNS packet using the name server library (function
ns_initparse) and some DNS packets have questions for "."

Thanks in advance