Re: [soa-rm] Architectural Scope of Reference Model

[Duane Nickull <dnickull@adobe.com>]

Would it be fair (and legal) to state that "contract" is a 
specialization of the abstract metadata class and also stereotype it as 
an abstract class?

Duane


Francis McCabe wrote:

> The problem with this diagram is that it assumes that a contract *isa* 
> metadata. I could not disagree more. And UML makes this awkward.
>
>  The relationship between a contract (which is an abstract entity) and 
> its description (which is a document) is one of *describes*.
>
> On the other hand, a QoS agreement *isa* contract.
>
> I also included the stuff on choreography, business policy etc.
>
> I believe that choreography is part of the syntax -- it is part of 
> what you need to know about the mechanics of using the service. But it 
> is separate from business logic and semantics.
>
> Frank
>
>
>
> On Apr 20, 2005, at 2:09 AM, Gregory A. Kohring wrote:
>
>> OK, here is a slightly different view using UML.  In this view
>> metadata is the higher level abstraction, while contract is a more
>> specialized abstraction.
>>
>> -- Greg
>>
>> Duane Nickull wrote:
>>
>>> Francis:
>>>
>>> Cool!  This is perhaps a place where using UML to avoid ambiguity 
>>> may be
>>> good.
>>>
>>> If I read your diagram, it asserts that "realized as" implies an
>>> "abstract-concrete" association.  I had viewed that the other concepts
>>> are more of a "can be aggregated as part of" association.  My
>>> observation is that usually the abstract-concrete association is often
>>> used for mapping a specific protocol or specification to a concept in a
>>> reference model or reference architecture.
>>> I guess the question we need to consider is "what is the association
>>> between the higher level abstract concept of metadata and specialized
>>> metadata concepts?".
>>>
>>> Anyone care to take a stab at this as a UML class diagram (or answering
>>> the question)?
>>>
>>> Cheers (and beers next week)
>>>
>>> Duane
>>>
>>>
>>>
>>>
>>> Francis McCabe wrote:
>>>
>>>> I prefer the following diagram :)
>>>>
>>>>
>>>> Frank
>>>>
>>>> On Apr 19, 2005, at 9:51 AM, Duane Nickull wrote:
>>>>
>>>>> <Drawing1.png>
>>>>
>> <metadata.pdf>
>
>

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