-In most cases, you create the target service and then use the contracts and message types created for the target service to create an initiating service. In some cases, however, you may create a target service for an initiating service that is already defined. In these cases, the target service uses the message types and contracts that the initiating service uses. For example, if you are creating a target service to receive event notifications, you use the contract **https://schemas.microsoft.com/SQL/Notifications/PostEventNotification**, because this is the contract that the initiating service uses.
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