- From: Yalcinalp, Umit <umit.yalcinalp@sap.com>
- Date: Mon, 12 Feb 2007 11:15:24 -0800
- To: <public-ws-policy@w3.org>
- Message-ID: <2BA6015847F82645A9BB31C7F9D641650362AD3F@uspale20.pal.sap.corp>
The following text completes our action item 218 for Subject Attachment Extensibility. It is proposed as a new subsection in Section 5. Umit and Maryann [Action 218] http://www.w3.org/2005/06/tracker/wspolicy/actions/218 Note: The text will use the reference that is already existing in the guidelines document to WS-RM Policy. ------------------------------------- 5.3 Subject Attachment Extensibility: Overtime, a policy expression may evolve to be applicable to policy subjects different than the policy subjects that it was originally designed for. When this type of evolution occurs, the author of the assertion should carefully consider the applicability of this usage with respect to the compatibility of the assertion's semantics. When an assertion needs to evolve to indicate a behavior that is no longer compatible with its originally intended semantics or policy subjects, a new namespace should be designed to designate the new behavior that is signified with the new namespace. Section 5.2 further clarifies the usage of multiple behaviors. In general, it is NOT recommended to deprecate policy subjects by reducing the policy subjects that an assertion was originally designed for. When the assertion's semantics does not change to invalidate any of the original policy subjects but new policy subjects need to be added, it may be possible to use the same assertion to designate the additional policy subjects without a namespace change. The authors must retain the compatible behavior of the policy assertion. For example, a policy assertion for a protocol that is originally designed for endpoint policy subject may add message policy subject to indicate finer granular attachment provided that endpoint policy subject is also retained in its design. This approach has been used by WS-RM Policy. ---------------------- Dr. Umit Yalcinalp Research Scientist SAP Labs, LLC Email: umit.yalcinalp@sap.com Tel: (650) 320-3095 SDN: https://www.sdn.sap.com/irj/sdn/weblogs?blog=/pub/u/36238 -------- "Nearly all men can stand adversity, but if you want to test a man's character, give him power." Abraham Lincoln.
Received on Monday, 12 February 2007 19:14:03 UTC