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Subject: Re: [soa-rm-ra] Thoughts on Needs and Capabilities Section

The distinction of SOAs between ownership domains and
that of the single ownership domain is useful.  The
committee has discussed this distinction in terms of
an Internet SOA ("encompasses two or more independent
entities") and an Enterprise SOA ("established in each


--- Don Flinn <flinn@alum.mit.edu> wrote:

> I have begun going over the RA chapters on the Wiki.
>  Paragraph 3 of the
> Needs and Capabilities section raised some questions
> for me.
> In the RM we purposely excluded details of the
> consumer, while in this
> section we bring in the consumer as 'part' of a SOA.
> Let us assume there are two companies, one with a
> need, company N, and
> another with a capability, company C, which
> satisfies that need.  Is
> there one SOA encompassing the two,independent
> companies or does each
> company construct and have its own SOA?  From an
> abstract point of view,
> the SOA of company N is not complete until its SOA
> establishes an
> Execution Context with C, even if that connection is
> only done once and
> then N uses a different company C' for its next
> satisfaction of need,
> establishing a new abstract SOA.
> The consequence of this is that N must construct its
> SOA with the
> realization that its SOA must join with the SOAs of
> other entities to
> produce the Real World Effect required and thus
> complete its SOA.  This
> requires that N establish the infrastructure,
> defined in the RM, for
> completing Visibility, establishing an Interaction
> and Execution
> Context, etc, with different entities, and with the
> realization that
> each completion of its SOA may be ephemeral. 
> I've used the concept SOA in two senses - an
> abstract definition which
> encompasses two or more independent entities and a
> more concrete SOA,
> which is established in each company.  The later
> definition is necessary
> as each company designs its own architecture,
> independent of any other
> specific entity.  Is this distinction useful as we
> move from the RM to
> the RA, which is then to be used to design concrete
> architectures? 
> Don
> -- 
> Don Flinn
> President, Flint Security LLC
> Tel: 781-856-7230
> Fax: 781-631-7693
> e-mail: flinn@alum.mit.edu
> http://flintsecurity.com

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