A basic WS Arch triangle

I was drawing this diagram and thought it may be relevant for the WS
architecture doc. The emphasis here is on two basis elements of Service
Oriented Architectures: contract (with interface definitions and
business sematics) and messaging (for business interactions). It's just
another way of looking at the same magic triangle in Heather's diagrams.

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-- Igor Sedukhin .. (igor.sedukhin@ca.com)
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