Mapping inputs are the endpoints through which data flows into a mapping. Mapping outputs are the endpoints through which data flows out of a mapping. Mapping inputs include source qualifier instances, lookup procedure instances, stored procedure instances, and mapplet instances that provide source data for the mapping. Mapping outputs are the target definition instances.

If you view a mapping that includes a mapplet instance, Metadata Manager hides the mapplet instance unless the mapplet provides source data for the mapping. Mapplets that provide source data for a mapping are called source mapplets.

In the summary view, Metadata Manager displays the inputs and outputs for source mapplets but hides the transformation instances that change the data. Inputs for source mapplets include source qualifier instances, lookup instances, and stored procedure instances. Outputs for source mapplets are the Output transformation instances.

For example, a PowerCenter mapping includes two source definition instances, two Source Qualifier transformation instances, a mapplet instance that provides source data for the mapping, a Joiner transformation instance, and two target definition instances.

The following image shows the mapping in the summary view:

To see all of the transformation instances within the mapping, switch to the detail view.

The following image shows the same mapping in the detail view: