# Copybook transformation steps in PDI

PDI has two transformation steps you can use to read mainframe records from a file and transform them into PDI rows. These steps are intended for data scientists with mainframe file and copybook experience.

* [**Copybook input**](/pdia-data-integration/10.2-data-integration/pdi-transformation-steps-reference-overview/copybook-input-pdi-step.md)

  This step reads the mainframe files that were originally created using the copybook definition file and outputs to the PDI stream for use in transformations.
* [**Read metadata from Copybook**](/pdia-data-integration/10.2-data-integration/pdi-transformation-steps-reference-overview/read-metadata-from-copybook.md)

  This step reads the metadata of a copybook definition file to use with [ETL Metadata Injection](/pdia-data-integration/10.2-data-integration/pdi-transformation-steps-reference-overview/etl-metadata-injection.md) in PDI.


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