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Subject: Re: [sca-policy] EXternal Policy Attachment -- Issue 15
- From: Mike Edwards <mike_edwards@uk.ibm.com>
- To: OASIS Policy <sca-policy@lists.oasis-open.org>
- Date: Thu, 10 Jan 2008 14:32:18 +0000
Folks,
First some comments on the proposal:
I think my main concerns over the proposal
relates to the "big picture" of where the ExternalPolicyAssociations
live and
how they get applied to SCDL files in
contributions in the domain. This is unclear in the current proposal.
The sorts of questions I have are along
these lines:
1) Can I include ExternalPolicyAssociations
in one contribution and have them apply to SCDL within other contributions
without having to say anything about
them in the target contributions?
Perhaps some folk don't want to see
this level of function, but it does serve one purpose: that of the deployer
being
able to impose a set of policies across
the board with minimal effort.
2) Do the ExternalPolicyAssociations
target FILES or XML ELEMENTS in specific namespaces. This is left
very
unclear. I can potentially see
the desirabiity of both types of addressing.
3) The XPath targetting expressions
work beautifully for targets that are XML, and I note that Ashok gives
an example where
aspects of an interface expressed as
WSDL are targeted. However, what if the interface were expressed
as Java?
I note that our current clumsy system
of addressing operations within interfaces within the SCDL does allow any
interface
type to be addressed. This system
does not - it seems limited to WSDL.
4) What happens if the external policy
attachment(s) clash either with each other OR with any existing policy
metadata
already attached to the target element(s).?
- in my opinion, it's simply an error
if the attachments violate an intent already present on the target
- we can make it a rule that any policies
and policy sets applied in this way override any already attached to the
target
- I don't know what to do if two external
attachments end up targeting the same element(s) - do they both apply,
or do
we aim to provide a disambiguation rule,
or do we simply flag an error?
Yours, Mike.
Strategist - Emerging Technologies, SCA & SDO.
Co Chair OASIS SCA Assembly TC.
IBM Hursley Park, Mail Point 146, Winchester, SO21 2JN, Great Britain.
Phone & FAX: +44-1962-818014 Mobile: +44-7802-467431
Email: mike_edwards@uk.ibm.com
ashok malhotra <ashok.malhotra@oracle.com>
02/01/2008 16:53
Please respond to
ashok.malhotra@oracle.com |
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Subject
| [sca-policy] EXternal Policy Attachment
-- Issue 15 |
|
I'm attaching a revised proposal for External Policy
Attachment.
http://www.osoa.org/jira/browse/POLICY-15
This assumes that the External Attachment file refers to the SCDL files
it applies to by QName.
I have some questions about this but Dave assures me that that's how it
is.
--
All the best, Ashok
[attachment "External SCA Policy Attachment - v2.doc" deleted
by Mike Edwards/UK/IBM] ---------------------------------------------------------------------
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External SCA Policy Attachment - v2_MJE.doc
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