Passing DataSet or DataSet as XML through Service Interface

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Hi,

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I am building middle tier which is consumed through WCF Service Interface. As of now it is planned to used by a Windowsclient app. User is contemplating on web interface in future date...

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Here is what I am planning to do..

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Service Interface layer: Contains Message Contracts( ex: OperationRequestContract, OperationResponseContract)

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Adapter: to convert Service Interface Contract in to Business entities

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Business Entities:�  Object needs to be used in Business logic and Resource Access layers( eg: xmldataset object containing two string variables, one to hold xml data and other to hold xml schema)

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Business logic: Go to the complete details ...