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The service contract is only one part of the story, however. The operations in a service contract can take parameters and return values. Client applications must provide data formatted in a manner that the service expects. Many of the primitive types in the .NET Framework have predefined formats, but more complex data types such as classes, structures, and enumerations require the service to specify how client applications should package this information up in messages that it sends to the service and the format for any information sent by the service back to client applications. You encapsulate this information in data contracts. Each complex data type used by a service should have a corresponding data contract. The service publishes this information together with the service contract, and the definitions of each complex type are included in the proxy code generated by the svcutil utility.