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What is an enum? Enums are a way to better support categorical attribute types. This allows you to create child catalog types from a parent catalog type. 
{
  "outputs": [
    {
      "name": "Teams",
      "description": "Team in org",
      "type_name": "Custom[\"Teams\"]",
      "source": {
        "name": "goal",
        "external_id": "external_id"
      },
      "attributes": [
        {
          "id": "description",
          "name": "Description",
          "type": "Text",
          "source": "description"
        },
        {
          "id": "email",
          "name": "Email list",
          "source": "emails",
          "array": true,
          "enum": {
            "name": "List of emails",
            "type_name": "Custom[\"ListOfEmails\"]",
            "description": "List of all team members"
          }
        },
        {
          "id": "name",
          "name": "Goal",
          "type": "Text",
          "source": "goal"
        }
      ]
    }
  ]
}
In the sample above a Team catalog type will be created with name, description, and email attributes. The List of emails attribute will be created as a child attribute catalog type from the parent Teams.

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Why does this matter?

Having child catalog types for these attributes allows workflows to know which options that attribute supports and gives you a drop-down instead of being textual.