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   RE: [xml-dev] Web Services/SOA (was RE: [xml-dev] XML 2004 weblog items?

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> -----Original Message-----
> From: Rich Salz [mailto:rsalz@datapower.com] 
> Sent: Monday, November 29, 2004 7:23 PM
> To: Dare Obasanjo
> Cc: Mark Baker; Chiusano Joseph; xml-dev@lists.xml.org
> Subject: RE: [xml-dev] Web Services/SOA (was RE: [xml-dev] 
> XML 2004 weblog items?)
> > Or is there an 'RPC architectural style' that I am unaware of?
> Yes:  a "method name" and calling sequence (e.g., multiple 
> parameters) and return value.  In SOA, you think more of 
> sending XML documents around and there's only one method, 
> probably POST, and some meta-data, like a URI/URL.
> It is admittedly kinda fuzzy-wuzzy, but that's not uncommon 
> when you start talking about "architecture." :)

So SOA is RPC with a calling convention for methods? Sounds silly to me.
I like Don's four fundamentals of service orientation from

* Boundaries are explicit 
* Services are autonomous 
* Services share schema and contract, not class 
* Service compatibility is determined based on policy 

It's basically a philosophy on how one should treat building distributed
application instead of a way to repackage yesterday's technology with
today's buzzwords so one can charge an arm and a leg for building
applications with tomorrow's toolkits.

I especially like the fact that it's quite easy to see how RESTful
applications are service oriented using those guiding principles. 

Ade's Law: Anybody can win -- unless there happens to be a second entry.

This posting is provided "AS IS" with no warranties, and confers no


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