RE: Proposed wording for my action on "domain"

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/paulc

 

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Paul Cotton, Microsoft Canada
17 Eleanor Drive, Ottawa, Ontario K2E 6A3
Tel: (613) 225-5445 Fax: (425) 936-7329
mailto:Paul.Cotton@microsoft.com





________________________________

From: public-ws-policy-eds-request@w3.org
[mailto:public-ws-policy-eds-request@w3.org] On Behalf Of Maryann Hondo
Sent: August 2, 2006 11:13 AM
To: public-ws-policy-eds@w3.org
Subject: Proposed wording for my action on "domain"

 


As per my actions:  http://www.w3.org/2006/07/27-ws-policy-minutes.html
<http://www.w3.org/2006/07/27-ws-policy-minutes.html> : 
<scribe> ACTION: editors to clear up 3.4 paragraphs about domain and
also define domain expression [recorded in
http://www.w3.org/2006/07/13-ws-policy-minutes.html#action15
<http://www.w3.org/2006/07/13-ws-policy-minutes.html#action15> ] 

 Although the Action Items refers to text in section 3.4 there is no
specific reference to "domain" in this section. 
Here is the list of my suggested changes for "domain" ( in red is my
proposals, in black is the current text, and bold blue is the current
use of "domain") 

Maryann 

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

CURRENT/Proposed changes: 

Domain - The original etymological implication of the word domain
carries the idea of "something ruled". In Information Technology it
commonly refers to a machine or a host on the Internet.(
http://en.wikipedia.org/wiki/Domain) 

A "WS-Policy Domain" is a logical grouping  of assertions that a
particular community has agreed to define (in conformance with the
WS-Policy specifications) to facilitate the interoperability of web
services within that community of interest. 

A "WS-Policy domain expression" is an XML representation of a capability
or a constraint within the context of a WS-Policy domain or community of
interest. 

1.1 Goals 
The goal of Web Services Policy 1.5 - Framework is to provide the
mechanisms needed to enable Web services applications to specify policy
information. Specifically, this specification defines the following: 

*	An XML Infoset called a policy expression that contains
domain-specific, Web Service policy information. 
*	A core set of constructs to indicate how choices and/or
combinations of domain-specific policy assertions apply in a Web
services environment.

.... 
3.1 Policy Assertion 
A policy assertion
<http://dev.w3.org/cvsweb/~checkout~/2006/ws/policy/ws-policy-framework.
html?content-type=text/html;%20charset=utf-8#policy_assertion>
identifies a behavior that is a requirement (or capability) of a policy
subject
<http://dev.w3.org/cvsweb/~checkout~/2006/ws/policy/ws-policy-framework.
html?content-type=text/html;%20charset=utf-8#policy_subject> .
Assertions indicate WS-Policy domain-specific (e.g., security,
transactions) semantics and are expected to be defined in separate,
WS-Policy domain-specific specifications [i.e. WS-SecurityPolicy,
WS-ReliableMessagingPolicy] .Assertions are strongly typed by the domain
authors that define them. The policy assertion type
<http://dev.w3.org/cvsweb/~checkout~/2006/ws/policy/ws-policy-framework.
html?content-type=text/html;%20charset=utf-8#policy_assertion_type>  is
identified only by the XML Infoset [namespace name] and [local name]
properties (that is, the qualified name or QName) of the root Element
Information Item representing the assertion. Assertions of a given type
MUST be consistently interpreted independent of their policy subjects
<http://dev.w3.org/cvsweb/~checkout~/2006/ws/policy/ws-policy-framework.
html?content-type=text/html;%20charset=utf-8#policy_subject> . 
WS-Policy Domain authors MAY define that an assertion contains a policy
expression
<http://dev.w3.org/cvsweb/~checkout~/2006/ws/policy/ws-policy-framework.
html?content-type=text/html;%20charset=utf-8#policy_expression>  as one
of its [children]. Policy expression nesting is used by WS-Policy domain
authors to further qualify one or more specific aspects of the original
assertion. For example, security domain authors may defined an WS-Policy
assertion describing a set of security algorithms to qualify the
specific behavior of a security binding assertion. 
The XML Infoset of an assertion MAY contain a non-empty [attributes]
property and/or a non-empty [children] property. Such content MAY be
used to parameterize the behavior indicated by the assertion. For
example, an assertion identifying support for a specific reliable
messaging mechanism might include an attribute information item to
indicate how long an endpoint will wait before sending an
acknowledgement. 
WS-Policy Domain authors should be cognizant of the processing
requirements when defining complex assertions containing additional
assertion content or nested policy expressions. Specifically, WS-Policy
domain authors are encouraged to consider when the identity of the root
Element Information Item alone is enough to convey the 

4.4 Policy Intersection 
Policy intersection is useful when two or more parties express policy
<http://dev.w3.org/cvsweb/~checkout~/2006/ws/policy/ws-policy-framework.
html?content-type=text/html;%20charset=utf-8#policy>  and want to limit
the policy alternatives
<http://dev.w3.org/cvsweb/~checkout~/2006/ws/policy/ws-policy-framework.
html?content-type=text/html;%20charset=utf-8#policy_alternative>  to
those that are mutually compatible. For example, when a requester and a
provider express requirements on a message exchange, intersection
identifies compatible policy alternatives (if any) included in both
requester and provider policies. Intersection is a commutative,
associative function that takes two policies and returns a policy. 
... 
Because the set of behaviors indicated by a policy alternative
<http://dev.w3.org/cvsweb/~checkout~/2006/ws/policy/ws-policy-framework.
html?content-type=text/html;%20charset=utf-8#policy_alternative>
depends on the domain-specific semantics of the collected assertions,
determining whether two policy alternatives are compatible generally
involves WS-Policy domain-specific processing. As a first approximation,
an algorithm is defined herein that approximates compatibility in a
WS-Policy domain-independent manner; specifically, for two policy
alternatives to be compatible, they must at least have the same
vocabulary (see Section 3.2 Policy Alternative
<http://dev.w3.org/cvsweb/~checkout~/2006/ws/policy/ws-policy-framework.
html?content-type=text/html;%20charset=utf-8#rPolicy_Alternative> ). 
... 
Assertion parameters
<http://dev.w3.org/cvsweb/~checkout~/2006/ws/policy/ws-policy-framework.
html?content-type=text/html;%20charset=utf-8#policy_assertion_parameter>
are not part of the compatibility determination defined herein but may
be part of other, domain-specific compatibility processing. 
... 
As this example illustrates, compatibility between two policy assertions
is based on assertion type and delegates parameter processing to
domain-specific processing. 
... 
Note that there are > 1 assertions of the type sp:SignedParts ; when the
behavior associated with sp:SignedParts is invoked, the contents of both
assertions are used to indicate the correct behavior. Whether these two
assertions are compatible depends on the domain-specific semantics of
the sp:SignedParts assertion. To leverage intersection, assertion
authors are encouraged to factor assertions such that two assertions of
the same assertion type are always (or at least typically) compatible.