Blogarithms
Doug Kaye's thoughts on web services, web hosting and managed services.
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Brent on BPEL. Last week I mentioned that Eric Knorr had covered the merger of IBM's Web Services Flow Language (WSFL) and Microsoft's XML Language (XLang) into BPEL4WS (BPEL for short). Now Brent Sleeper asks, "Is the proposed standards really independent of a particular product implementation?" and, "Do the proposed standards support a variety of complex, stateful, asynchronous, etc., business processes interactions?"
Posted Monday, August 19, 2002 10:49:54 PM 
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SODA. Jason Bloomberg, senior analyst at ZapThink, summarizes his Seven Principles of Service-Oriented Development in this article in XML & Web Services Magazine. Jason is one of the better analyst/writers on web services, although I can't agree with him on every point. For example:
- A Web services architect does not have the luxury of combining business and presentation logic. [True.]
- Coding for Broad Applicability Supersedes Coding for Reusability. [...The] aim is to create code that is flexible and broadly applicable. [An excellent observation.]
- Scalability Handled Bottom-Up, Instead of Top-Down...If a system experiences unexpected traffic, it can automatically find backup services in a registry, obtain their service descriptions, and bind to the supplemental services on the fly. [I disagree. Any system that can fail-over to an alternative service on the fly must be, by defninition, designed at a level above the switching point.]
- Instead of taking this top-down approach, service-oriented development takes a bottom-up approach. [More of the above. I disagree. One still needs to determine the required components first.]
- Platform Dependence Gives Way to Platform Irrelevance...[Referring to the old component-based approach...] The components are soccer players who kick a ball to each other, and the platform is the field. Needless to say, two players will find it difficult to interact if they are on different fields. [One of my favorites.]
The article is a tease for ZapThink's $50-per-page research report: Insight: How Service-Oriented Development Will Transform the Software Industry.
Posted Monday, August 19, 2002 11:53:10 AM
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