Relation to other specs

[David Hull <dmh@tibco.com>]

In the draft I just sent, I've added a small section on relation to other specs.  Regardless of what decisions we make in this regard, I believe it's a good idea to have such a section.  Here is the version as it stands in the draft:

1.1      Relation to Other Specifications

This specification makes extensive use of endpoint references.  An endpoint reference, as defined in WS-Addressing, consists of a transport-specific physical address together with an arbitrary reference properties element - typically an opaque ID unique to the service.  Taken as a whole, these may designate a particular stateful object, or resource, managed by the Web Service at the given physical address.  For example, different subscriptions' endpoint references may share the same physical address but have different reference properties.  This allows multiple objects to be managed through a single physical address.

In the non-normative SOAP message exchanges, the components of endpoint references appear as SOAP headers.  This is a direct result of the SOAP binding of WS-Addressing.

WS-BaseNotification relies on WS-Policy to negotiate various parameters such as security, quality of delivery service, continuity of messaging in the face of changes to an existing subscription, implicit termination of subscriptions, transport-level options and any other parameters not explicitly defined here.

WS-Notification objects MAY present themselves as resources in the sense of WS-ResourceFramework in addition to supporting the direct messages described here.  That is, they may provide a resource properties document and support the various get, set and query methods defined in that specification.  This is true of any service representing stateful objects.  However, this specification gives explicit mappings to the WS-ResourceFramework interfaces.

Subscriptions made via WS-BaseNotification MAY be subject to scheduled termination as defined in WS-ResourceLifetime.  This behavior is negotiable by policy.