A Question: Suppose you need to develop a web application for which you are not sure in which technology (java/.NET/php) of the Presentation Layer will be based on; (I mean you are still don't know what technology will be used for Presentation Layer); and you need to FOCUS on Business Layer & Data Layer (or anything else that you need to create for an n-Layered Architecture). WHAT will be your approach?
Answer is: Creating Web Service. That can be exposed to Presentation Layer which can be based on any technology. Because Web Services use Extensible Markup Language (XML) messages which is respected by any technology :)
More details on SOA (Service Oriented Architecture) @
SOA - Wiki
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