# Mapping Output Specification

![Mapping Output Specification dialog](/files/MCLITjMtyt5RuJaZcRKm)

This step acts as an output place-holder in a Mapping sub-transformation. It describes the places (0 or more) in the mapping where output is expected to occur. You can think of it as a special output step that allows the parent transformation to receive data from a sub-transformation.


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