Self-sigs with trusted key

[Ivan Boldyrev]

I have Werner's key:

pub  1024D/5B0358A2  created: 1999-03-15  expires: 2009-07-11
                     trust: full          validity: full
sub  2048R/B604F148  created: 2004-03-21  expires: 2005-12-31
sub  1024D/010A57ED  created: 2004-03-21  expires: 2007-12-31
[    full] (1). Werner Koch <wk@***.org>
[    full] (2)  Werner Koch
[ unknown] (3)  Werner Koch <wk@***.com>

You see, key is trusted and valid.  Third user ID is signed by Werner
but is not signed by anyone of my ring, but first and second IDs are
signed by other trusted persons and valid then.

I do not understand why third UID is not valid while it has self-sig
with trusted key?

$ gpg --version
gpg (GnuPG) 1.3.6
NOTE: THIS IS A DEVELOPMENT VERSION!

-- 
Ivan Boldyrev

                       Perl is a language where 2 x 2 is not equal to 4.
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