Federation vs P2P discovery

On the WSAWG telecon on 2003-12-11, I discussed some thoughts about 
modeling discovery as being described by a choreography.

Katia, I think, disagreed and introduced the notion of peer-to-peer (P2P) 
discovery.  Was it that a choreography would not apply in P2P discovery?

Katia also seemed to distinguish between several exchanges to a UDDI 
registry (find business, get business, get service, get binding), versus a 
sequence of exchanges that cross from one registry to another (perhaps, 
from peer to peer?).  Is the point that a sequence within a registry would 
not require a choreography, but exchanges across boundaries would merit a 
choreography?

Please clarify the points you were raising.

Paul