> From a use-case point of view, I think this capability (to request that
> a new federation not be created if one doesn't already exist) is most
> useful in combination with passive authentication requests, where the
> idea is to probe for an existing federation in combination with an
> active session. The idea being that, even if an active session exists
> at the IdP, I might want to have users explicitly choose to federate
> with my site if they haven't done so before. Note that this overlaps
> somewhat with the idea of 'consent' in ID-FF.
Exactly what I've been trying to say, thanks. I'm only objecting to this
being characterized as a "privacy" issue or some kind of critical control
flag for the SP to make the system function properly. It's a UI
consideration. It may or may not make sense to actually use the consent flag
for this, but that's what it's about.
-- Scott