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   RE: [xml-dev] Re: Major Historical SOA Milestone Today

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  • To: "bryan rasmussen" <rasmussen.bryan@gmail.com>
  • Subject: RE: [xml-dev] Re: Major Historical SOA Milestone Today
  • From: "Bullard, Claude L \(Len\)" <len.bullard@intergraph.com>
  • Date: Thu, 11 May 2006 15:08:21 -0500
  • Cc: <xml-dev@lists.xml.org>
  • Thread-topic: [xml-dev] Re: Major Historical SOA Milestone Today

Try:  It tells you where the focal point of the domain is.

Viewpoints:  details are chaotic or organized depending on the proximity
of the viewpoint to domain.  A baseball is a point at 100 feet, a sphere
at five feet, a curved surface at 1 inch, a cylinder wrapping a center
at 1/10 inch, a fiber mass at 1/100 and so on.  How well you understand
the domain depends on the focal resolution of the viewpoint.

The focal point of SOA is when one decomposes a business into requests
for services by type regardless of implementation.   That is why an
object oriented architecture is not an SOA.  OOP is a closer viewpoint
and one may not need it for the SOA viewpoint (eg, one can implement an
SOA without objects but I wouldn't want to do that).

Yes, both REST and WS can be used to implement an SOA.  We've had that
debate here before.  As I recall, it came down to how much hand rolling
one wanted to do to build the product.


From: bryan rasmussen [mailto:rasmussen.bryan@gmail.com] 

> Or could someone correct me? If I bumped into a service-oriented IT
> in one bank on one side of the street, and an object-oriented IT
system in
> another bank on the other side of the street, how would I tell which
> which (other than by the choice of jargon on the Powerpoint slides)?

an anecdote of minor interest. We had a student in our office that did
his thesis on SOA. got a very good grade, has a nice job now. This guy
was quite smart and technically competent as well, I attempted a few
times to get a description of SOA out of him. I never did get anything
that I recognized as being technical, although whenever he talked
about it he got that abstracted look that I get trying to explain
various technical things to people. But anyway, I DID manage to
confirm from him that both REST and SOAP-based webservices were SOA.

Not sure if that helps narrow it down though ;)


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