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    [ServiceContract(ProtectionLevel = ProtectionLevel.EncryptAndSign,
                        SessionMode=SessionMode.Required)]
    public interface IEHR
    {
        [OperationContract(IsInitiating=true)]
        void StartSession(string recordTargetRoot, string recordTargetExtension);

        [OperationContract(IsTerminating=true)]
        void EndSession();

        [OperationContract]
        void AddVersionedDocument(Message request);

        [OperationContract]
        Message GetVersionedDocument(string documentRoot, string documentExtension);

        [OperationContract]
        Message GetVersionedDocumentTransformed(string documentRoot, string documentExtension, string transformRoot, string transformExtension);

        [OperationContract]
        void Commit();
    }