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Re: NEW ISSUE 4130: Ignorable assertions must be ignored

From: Sergey Beryozkin <sergey.beryozkin@iona.com>
Date: Tue, 2 Jan 2007 16:06:07 -0000
Message-ID: <009201c72e87$e93c8a30$3901020a@sberyoz>
To: "Ashok Malhotra" <ashok.malhotra@oracle.com>, <public-ws-policy@w3.org>
Hi

I'm finding this intriguing...So you suggest to have wsp:ignorable assertions be completely ignored at the intersection engine. 

This will mean then that the only way for those providers who wish to advertize assertions such that aware requesters can use them and unaware requesters can ignore them is to use wsp:optional. 

This is actually what we proposed originally but the group decided on the introdution of wsp:ignorable instead (and useful strict and lax intersection modes) and keep the semantics associated with wsp:optional intact. 

As fars as I understand you can achive the ignorability you're looking for by using a lax intersection mode on the requester's side and do not specify an assertion marked by a provider as ignorable in the list of requester's requirements.

Cheers, 
Sergey Beryozkin



Title

Ignorable assertion must be ignored

Description

At the last f2f meeting the WS-Policy WG agreed to add an attribute called
'ignorable' to the WS-Policy assertion syntax.  We think this is a step in the right direction.  The WG, however, blunted the effect of this change by
allowing the ignorable attribute to be ignored during policy intersection by
allowing two intersection modes one of which honors the ignorable attribute and the other which ignores it.

We argue this creates a problem as the parties attempting to agree on a policy alternative may use different forms of the intersection algorithm and come up with different solutions.  A standard that allows such variation is not very useful.

We suggest that the policy intersection algorithm be changed so that assertions marked ignorable are always ignored.
 
Justification

See above.

Target

WS-Policy Framework

Proposal 

1. In section 4.5 Policy Intersection, add a third bullet after the first two bullets that says:
o Assertions with ignorable = 'true' are ignored in during policy intersection.

2. Remove the first bullet, including its sub-bullets from the second set of 2 bullets.

3. Add an ignorable assertion to the following example.
Received on Tuesday, 2 January 2007 16:05:11 GMT

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