PersistentId / principalName

[Peter Schober]

* Ortner Nikolaus <N.Ortner at fh-kaernten.at> [2012-07-05 10:46]:
> * user logs in with his new userid (and he previousely has used the
> * IdP so that an persistent entry with his old userid exists in the
> * database - and no one has updated it)
> * user's attributes are resolved, including the localId

Hm, now I think I understand Scott's remark in that context: That
assumes that you changed the netid but the account still has the same
"localId", thereby the IdP knows it's the same person? Then keying the
persistentId only from the attribute used as localId would be enough
and there's no need to ever look at the principalName or update
anything in the DB?
I probably still don't get it.
-peter