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[Bug 4951] Need example of assertion showing ordering between assertions

From: <bugzilla@wiggum.w3.org>
Date: Wed, 15 Aug 2007 12:14:55 +0000
To: public-ws-policy-qa@w3.org
Message-Id: <E1ILHm3-0000mP-WA@wiggum.w3.org>


           Summary: Need example of assertion showing ordering between
           Product: WS-Policy
           Version: PR
          Platform: PC
        OS/Version: Windows XP
            Status: NEW
          Severity: normal
          Priority: P2
         Component: Guidelines
        AssignedTo: fsasaki@w3.org
        ReportedBy: ashok.malhotra@oracle.com
         QAContact: public-ws-policy-qa@w3.org

Consider a policy that includes Reliable Messaging, Header Encryption and
Signing.  It seems clear that the Reliable Messaging headers should be added
first, the headers encrypted next that finally the signature created and
affixed.  At the receiving end, the signature should be checked first, the
headers decrypted next and finally the Reliable Messaging headers processed. 
This implies that the Policy assertions be processed in a definite sequence.

The framework document says:
"Assertions within an alternative are not ordered, and thus aspects such as the
order in which behaviors (indicated by assertions) are applied to a subject
<http://www.w3.org/TR/2007/PR-ws-policy-20070706/#policy_subject> are beyond
the scope of this specification. However, authors can write assertions that
control the order in which behaviors are applied."

It seems to me that this is a fairly common scenario and it may be good to show
an example in the Guidelines document of how such an ordering assertion may be
Received on Wednesday, 15 August 2007 12:15:04 UTC

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