influence of signature type on trustdb

[Niels Laukens]

Hi,

I'm trying to figure out what the influence is of the different
signature types (0x10-0x13). As far as I can tell, they only _indicate_
the signers trust in his own sig, but isn't used in any way by GPG. Is
this correct?

I was hoping it would be used in the trust model, but apparently only
the ownertrust (and optionally tsign's) are used there.

Thanks in advance,
Niels