Re: [soa-rm-ra] Disambiguating Action (Part I)

On May 26, 2008, at 1:38 PM, michael.poulin@uk.fid-intl.com wrote:

I am risking to become annoing but my questions still stay:

I have four bright, challenging, and inquisitive children. �You have to go a long way before a train of evolving questions becomes annoying :-)

- In SOA eco-systems, how a consumer might even know about a Capability/resource other than through the services?�

Excellent question. �Per my previous response, *all* resources need description and an attribute that may make it attractive to use a particular resource is that it can be accessed through a SOA service. �So, what we need are resource/capability catalogs, not just service catalogs. �But let's not get started on this.

- Would you agree that neither Capability nor RWE are not necessary visible through the service interface?

The service interface is one aspect needed for effective interaction. �As I said in my original email on 21 May

As shown in Figure 20, the service description provides information on:�

- what a service does (its functionality and the resulting real world effects),�

- how to reach the service (protocols and the endpoint of service reachability),�

- how to communicate with the service (the information and behavior models that make up the service interface),

- what are the conditions of use (service policies and contracts), and

- what measurements of performance are available and how can these be accessed (service metrics).

Moreover, that one interface operation may correspond to muntiple Functions and multiple RWE?

Yes. �The interface is an aspect of the interaction and as stated in the RM:

There is not necessarily a one-to-one correlation between needs and capabilities; the granularity�

of needs and capabilities vary from fundamental to complex, and any given need may require the�

combining of numerous capabilities while any single capability may address more than one need.�

This was in the discussion of SOA before service was introduced, but it follows that you can get multiple RWE from interaction with a single "operation"/"action"/TBD. �For example, my accepting the terms of your proposed sale of something to me makes the thing mine and some of my money yours (pending appropriate completion).

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Ken Laskey

MITRE Corporation, M/S H305� � ��phone: 703-983-7934

7515 Colshire Drive�� fax:�� 703-983-1379

McLean VA 22102-7508

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