WS-Policy
From Wikipedia, the free encyclopedia
WS-Policyis a specification that allows web services to use XML to advertise their policies (on security, Quality of Service, etc.) and for web service consumers to specify their policy requirements.
WS-Policy was submitted to the W3C on the 25th April 2006.
WS-Policy represents a set of specifications that describe the capabilities and constraints of the security (and other business) policies on intermediaries and end points (for example, required security tokens, supported encryption algorithms, and privacy rules) and how to associate policies with services and end points.
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[edit] Policy Assertion
Assertions can either be requirements put upon a web service or an advertisement of the policies of a web service.
[edit] Operator tags
Two "operators" (XML tags) are used to make statements about policy combinations:
- wsp:ExactlyOne - asserts that only one child node must be satisfied.
- wsp:All - asserts that all child nodes must be satisfied.
Logically, an empty wsp:All tag makes no assertions.
[edit] Policy Intersection
The policy intersection is a semantic (as opposed to syntactic) intersection of two policies. The intersection is a new policy that complies with both their requirements/capabilities - or, if the policies are incompatible, this is discovered by both parties.
