Guy, I remember Jerry bringing this up in a call a couple of weeks ago and thought I would ask if we did anything to clarify or change the definitions. In the WSDL at the moment we have the following in all request, confirmed, and failed messages: <xsd:element name="requestorNSA" type="xsd:anyURI" /> <xsd:element name="providerNSA" type="xsd:anyURI" /> The issue brought up was the confusion between who is requestor, and who is a provider in a message exchange. I have captured some rules below to describe my interpretation, however, do we think it might be better to change these to toNSA and fromNSA? Not too sure... So in a request message from a parentNSA in an RA role to a childNSA in a PA role we would have: requestorNSA = parentNSA providerNSA = childNSA I assume in the response we would also have: requestorNSA = parentNSA providerNSA = childNSA So the simple rules for an NSA implementor are: 1. My NSA identifier in requestorNSA when sending a request to children, and the child NSA identifier in providerNSA. 2. My NSA identifier in providerNSA when sending a confirmed/failed to a parent, and the parent NSA identifier in requestorNSA. Now for the interesting bits: 1. Any pair of NSA can be both a parent NSA can be a child NSA to each other. In this scenario we would use the appropriate roles to cover when we are a parent or child. 2. The forcedEnd message is a request sent from a child to a parent. In this case the child propagating the forcedEnd message up the tree would put its NSA identifier in providerNSA and the parent in requestorNSA even though semantically this is a request message. 3. The Query message is also an interesting case since it can not only be sent to children, but from a child NSA to a parent NSA to retrieve information about common reservations. I would recommend the following rules to keep the proper context with respect to a reservation: 1. My NSA identifier in requestorNSA when sending to a child of a reservation, and the child NSA identifier in providerNSA. 2. My NSA identifier in providerNSA when sending to a parent were I am a child in the reservation, and the parent NSA identifier in requestorNSA. Comments? Discussion? John.