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Remaining use cases for this definition include (not exhaustively):

• Attaching <AttributeEncoder> plugins (or <Display> and <Description> elements) in the event that you prefer that to relying on the AttributeRegistryConfiguration

• Combining multiple source attributes into a new attribute containing a union of values

• Duplicating an existing attribute under a separate ID

• Conditionally producing an attribute object using an activation condition

• Pre-resolving an attribute so it can be used within another connector or definition's activation condition. See PreRequestedAttributes.

Configuring this definition typically requires adding at least one <InputAttributeDefinition> or <InputDataConnector> element> element.

Reference

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