One goal of Web Services and SOA is to separate the presentation layer from the application layer in a way that’s truly loosely coupled, composite and reusable, said Ron Schmelzer, senior analyst at Waltham, Mass.-based ZapThink LLC.

“The devil is in the details, however, since it is tricky to build interfaces that are appropriate for the devices and don’t require too much recoding as interfaces change,” he said. “Web Services and SOA hope to make those details significantly easier to solve.”

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