[saml-dev] Question about artifact & Destination site pairs.

Question about the following paragraf, 
cs-sstc-bindings-01:

 

521     The source site MUST 
return a response with no assertions if it receives a <samlp:Request> 
message 
522     from an authenticated destination site X 
containing an artifact issued by the source site to some other 

523     destination site Y, where X <>Y. One way 
to implement this feature is to have source sites maintain a list 

524     of artifact and destination 
site pairs. 

 

What information Source Site maintain  about Destination 
Site??

 

I'm maintaining a list of <artifact, IP of Destination site>

 

This's correct??