Manage suggested values in the API

For any string field in Experience Data Model (XDM), you can define an enum that constrains the values that the field can ingest to a predefined set. If you attempt to ingest data to an enum field and the value does not match any of those defined in its configuration, ingestion will be denied.

In contrast to enums, adding suggested values to a string field does not constrain the values that it can ingest. Instead, suggested values affect what predefined values are available in the Segmentation UI when including the string field as an attribute.

This guide covers how to manage suggested values using the Schema Registry API. For steps on how to do this in the Adobe Experience Platform user interface, see the UI guide on enums and suggested values.

Prerequisites

This guide assumes you are familiar with the elements of schema composition in XDM and how to use the Schema Registry API to create and edit XDM resources. Please refer to the following documentation if you require an introduction:

It is also strongly recommended that you review the evolution rules for enums and suggested values if you are updating existing fields. If you are managing suggested values for schemas that participate in a union, see the rules for merging enums and suggested values.

Composition

In the API, the constrained values for an enum field are represented by an enum array, while a meta:enum object provides friendly display names for those values:

"exampleStringField": {
  "type": "string",
  "enum": [
    "value1",
    "value2",
    "value3"
  ],
  "meta:enum": {
    "value1": "Value 1",
    "value2": "Value 2",
    "value3": "Value 3"
  },
  "default": "value1"
}

For enum fields, the Schema Registry does not allow meta:enum to be extended beyond the values provided under enum, since attempting to ingest string values outside of those constraints would not pass validation.

Alternatively, you can define a string field that does not contain an enum array and only uses the meta:enum object to denote suggested values:

"exampleStringField": {
  "type": "string",
  "meta:enum": {
    "value1": "Value 1",
    "value2": "Value 2",
    "value3": "Value 3"
  },
  "default": "value1"
}

Since the string does not have an enum array to define constraints, its meta:enum property can be extended to include new values.

Add suggested values to a standard field add-suggested-standard

To extend the meta:enum of a standard string field, you can create a friendly name descriptor for the field in question in a particular schema.

The following request adds suggested values to the standard eventType field (provided by the XDM ExperienceEvent class) for the schema identified under sourceSchema:

curl -X POST \
  https://platform.adobe.io/data/foundation/schemaregistry/tenant/descriptors \
  -H 'Authorization: Bearer {ACCESS_TOKEN}' \
  -H 'x-api-key: {API_KEY}' \
  -H 'x-gw-ims-org-id: {ORG_ID}' \
  -H 'x-sandbox-name: {SANDBOX_NAME}' \
  -H 'Content-Type: application/json' \
  -d '{
        "@type": "xdm:alternateDisplayInfo",
        "sourceSchema": "https://ns.adobe.com/{TENANT_ID}/schemas/fbc52b243d04b5d4f41eaa72a8ba58be",
        "sourceProperty": "/eventType",
        "title": {
            "en_us": "Enum Event Type"
        },
        "description": {
            "en_us": "Event type field with soft enum values"
        },
        "meta:enum": {
          "eventA": {
            "en_us": "Event Type A"
          },
          "eventB": {
            "en_us": "Event Type B"
          }
        }
      }'

After applying the descriptor, the Schema Registry responds with the following when retrieving the schema (response truncated for space):

{
  "$id": "https://ns.adobe.com/{TENANT_ID}/schemas/fbc52b243d04b5d4f41eaa72a8ba58be",
  "title": "Example Schema",
  "properties": {
    "eventType": {
      "type":"string",
      "title": "Enum Event Type",
      "description": "Event type field with soft enum values.",
      "meta:enum": {
        "customEventA": "Custom Event Type A",
        "customEventB": "Custom Event Type B"
      }
    }
  }
}

"standardField": {
  "type":"string",
  "title": "Example standard enum field",
  "description": "Standard field with existing enum values.",
  "meta:enum": {
    "standardEventA": "Standard Event Type A",
    "standardEventB": "Standard Event Type B",
    "customEventA": "Custom Event Type A",
    "customEventB": "Custom Event Type B"
  }
}

Manage suggested values for a custom field suggested-custom

To manage the meta:enum of a custom field, you can update the field’s parent class, field group, or data type through a PATCH request.

The following request updates the meta:enum of a “loyalty level” field provided by a custom data type:

curl -X PATCH \
  https://platform.adobe.io/data/foundation/schemaregistry/tenant/datatypes/_{TENANT_ID}.datatypes.8779fd45d6e4eb074300023a439862bbba359b60d451627a \
  -H 'Authorization: Bearer {ACCESS_TOKEN}' \
  -H 'x-api-key: {API_KEY}' \
  -H 'x-gw-ims-org-id: {ORG_ID}' \
  -H 'x-sandbox-name: {SANDBOX_NAME}' \
  -H 'Content-Type: application/json' \
  -d '[
        {
          "op": "replace",
          "path": "/loyaltyLevel/meta:enum",
          "value": {
            "ultra-platinum": "Ultra Platinum",
            "platinum": "Platinum",
            "gold": "Gold",
            "silver": "Silver",
            "bronze": "Bronze"
          }
        }
      ]'

After applying the change, the Schema Registry responds with the following when retrieving the schema (response truncated for space):

{
  "$id": "https://ns.adobe.com/{TENANT_ID}/schemas/fbc52b243d04b5d4f41eaa72a8ba58be",
  "title": "Example Schema",
  "properties": {
    "loyaltyLevel": {
      "type":"string",
      "title": "Loyalty Level",
      "description": "The loyalty program tier that this customer qualifies for.",
      "meta:enum": {
        "ultra-platinum": "Ultra Platinum",
        "platinum": "Platinum",
        "gold": "Gold",
        "silver": "Silver",
        "bronze": "Bronze"
      }
    }
  }
}

Next steps

This guide covered how to manage suggested values for string fields in the Schema Registry API. See the guide on defining custom fields in the API for more information on how to create different field types.