You can create a custom resource mapping by modifying a default resource mapping or by manually creating a REST web service.

The following image shows a custom resource mapping:

The mapping contains the following transformations:

To create this custom resource mapping, manually define the REST web service resource definition. When you manually define the resource definition, you define the elements in the response message. For this example, the response message contains just the customer ID and the total order amount.

After you define the resource definition, the Developer tool creates a resource mapping that contains an Output transformation. You then add the Read transformation and the other transformations to the mapping.

The customer ID in the previous image is the key. A web service client might request the number of orders for a specific customer. The Data Integration Service filters the output data by the key. The mapping does not contain a Filter transformation.