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NEW ISSUE: The framework specification should enable usage of xml:id

From: Yalcinalp, Umit <umit.yalcinalp@sap.com>
Date: Tue, 25 Jul 2006 13:54:22 -0700
Message-ID: <2BA6015847F82645A9BB31C7F9D6416501C78301@uspale20.pal.sap.corp>
To: <public-ws-policy@w3.org>

Title: The framework specification should also enable the usage of
xml:id

Description: 

The WS-Policy Framework specification uses wsu:id element to designate
identification for elements[WS-Policy]. W3C also published xml:id
document that allows the same use [XMLID] that is a recommendation.
Currently, the WS-Policy specification does not use the xml:id mechanism
for uniquely identifying XML elements and relies on the WSS definition
of id mechanism. 

Justification: 

The purpose of the xml:id specification is to have unique element
identifiers to be recognized by all conformant XML processors.
Currently, WS-Policy relies on WS-Security specification for generating
URI references instead and requires the framework providers to recognize
this alternate mechanism for processing references. As xml:id will be
adopted, the support of xml:id in all XML processors may require
WS-Policy to also allow utilization of xml:id. Further, the
specification does not clarify whether the xml:id is permissable as an
identification mechanism for a WS-Policy expression. 

Target: Section 4.2 of the WS-Policy, Appendix A. 

Proposal: 

Allow xml:id as a permissible mechanism for identifying policy
expressions in addition to wsu:Id 

1. Replace 

{/wsp:Policy/@wsu:Id 
	The identity of the policy expression as an ID within the
enclosing XML document. If omitted, there is no implied value. To refer
to this policy expression, a URI-reference MAY be formed using this
value per Section 4.2 of WS-Security [WS-Security 2004 <> ].}
With 
/wsp:Policy/{@wsu:Id | @xml:id}
	The identity of the policy expression as an ID within the
enclosing XML document. If omitted, there is no implied value. To refer
to this policy expression, a URI-reference MAY be formed using this
value per Section 4.2 of WS-Security [WS-Security 2004 <> ] when @wsu:Id
is used. 
2. Repeat last example in Section 4.2 using xml:id in addition to wsu:id
(last paragraph of Section 4.2) to illustrate the form. This is purely
editorial. 
3. Add normative reference to xml:id [XMLID] in A.1.  
Personal Note: 
I have chosen to retain the reference on wsu:Id given the expected
schedule of the publication rather than removing it due to existing
support on this attribute in the existing implementations. 
We could also add a note in the framework/primer when it is not
desirable to use xml:id but rely on wsu:id if the wg feels that is
necessary. 

--umit

[XMLID] http://www.w3.org/TR/xml-id/
[WS-Policy]
http://dev.w3.org/cvsweb/~checkout~/2006/ws/policy/ws-policy-framework.h
tml?content-type=text/html;%20charset=utf-8



----------------------

Dr. Umit Yalcinalp
Architect
NetWeaver Industry Standards
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
Received on Tuesday, 25 July 2006 20:51:30 GMT

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