the identifier issued to identify a Subscription, and subsequently used to refer to it in further exchanges within the Publish/Subscribe stateful resource pattern

NOTE In SIRI, the Subscription Reference comprises two parts: the Subscriber Reference (i.e. the Participant Code of the subscriber), and the Subscription Identifier: unique within the scope of a Participant Reference. Subscriber References are issued by a Subscriber in SIRI, not the Producer.

Formally in WS-PubSub, a subscription reference is a WS resource returned in a Subscription Response containing the address of the Subscription Manager, and the Subscription Identifier. In SIRI the address of the Subscription Manager is obtained indirectly.