Data Transformation Engine Map Designer Reference Guide

Chapter 5 - Card Settings Input and Output Card Settings
Map Designer Reference Guide
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The Document Type > Metadata value must be set to either DTD or
Schema.
A DTD or schema file location must be specified (Document Type >
Location).
In the Map Designer, the following should apply in the map input card:
The Schema > Type is set to the object you associated with the Document
Type above.
The SourceRule > GET > Source > DocumentVerification setting is set to
Always, OnSuccess, or OnFailure.