Hitoshi,
I share your opinion (and the Steve's one) on the policy viewed independently. To my understanding, a Contract may or may not refer/include policy(ies). However, it is not clear to me what kind of policies a consumer can bring to the table to negotiate with a service provider; it is simple offer - take this one or another one. The offers differ in the included provider's policies, I think. The contract is a combination of policies and many other things.
ESB to me is a communication pipeline with a capacity in data transformation, not an "intermediary" in the of policy-contract space. If an ESB would be the intermediary, the consumer and the provider were not needed to negotiate with each other but rather with ESB(?) from both sides. If a service is provided via an ESB, the ESB becomes a part of the service offering. Period. An ESB may not become an excuse for the Service if it fails.
- Michael
Hitoshi Ozawa <[EMAIL PROTECTED]> wrote:
As you mentioned, a policy usually does not cover the entire contract, but
I personally don't like the idea of a "policy" turning into a contract.
I view a policy to be a set of conditions a consumer and provider brings to
a "table" to negotiate on the terms of a contract. We usually don't
negotiate
to change the other's policy, we use policy to negotiate on the contract.
Consequently, terms of a contract may end up being different on each
negotiation, but a policy usually remains the same across several
negotiations.
Additionally in my view, an ESB acts as a "intermediary" between a consumer
and a provider.
H.Ozawa
Dennis Djenfer wrote:
> Steve,
>
> I would like to add a comment to my first response to your answer. I
> like your "simplistic" way of discriminating between a policy and a
> contract, however I don't see that a policy on its own can turn into a
> contract. Before something can turn into a contract there must be
> enough information to make a successfull interaction between the
> parties, hence a policy is only a part of a whole that will turn into
> a contract when the actual interaction occurs.
>
> I think that an exemple of something that could turn into a contract
> when the interaction occurs is a WSDL-file together with adequate
> assertions (policies).
>
> // Dennis Djenfer
>
>
>
>
>
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