When a model that is based on a JSON, XML, or XSD file contains non-repeating output groups, Intelligent Structure Discovery adds a document identifier to each non-repeating output group.
For models that are based on other input types, you can add document identifiers to output groups manually.
For example, add document identifiers to a model if you want the Structure Parser transformation to join output groups that are based on the same input and then output them to a single target. You can also use the document identifiers to join groups with the Joiner transformation.
To add a document identifier to an output group, right-click the node that represents the group and select Add a Document ID. To remove the identifier, right-click the node and select Remove a Document ID.
In the model, document identifier fields appear in the Relational Output tab, in the following format: <group name>_documentId. For example, for a group named "organization" the document identifier field is organization_documentId.
In the Structure Parser transformation, a document identifier output field appears for each output group.