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Define a relationship between two schemas using the Schema Editor

The ability to understand the relationships between your customers and their interactions with your brand across various channels is an important part of Adobe Experience Platform. Defining these relationships within the structure of your Experience Data Model (XDM) schemas allows you to gain complex insights into your customer data.
This document provides a tutorial for defining a one-to-one relationship between two schemas defined by your organization using the Schema Editor in the Experience Platform user interface. For steps on defining schema relationships using the API, see the tutorial on defining a relationship using the Schema Registry API .

Getting started

This tutorial requires a working understanding of XDM System and the Schema Editor in the Experience Platform UI. Before beginning this tutorial, please review the following documentation:

Define a source and destination schema

It is expected that you have already created the two schemas that will be defined in the relationship. For demonstration purposes, this tutorial creates a relationship between members of an organization's loyalty program (defined in a "Loyalty Members" schema) and their favorite hotels (defined in a "Hotels" schema).
Schema relationships are represented by a source schema having a field that refers to another field within a destination schema . In the steps that follow, "Loyalty Members" will be the source schema, while "Hotels" will act as the destination schema.
For reference purposes, the following sections describe the structure of each schema used in this tutorial before a relationship has been defined.

Loyalty Members schema

The source schema "Loyalty Members" is the schema that was constructed in the tutorial for creating a schema in the UI . It includes a "loyalty" object under its "\_tenantId" namespace, which includes several loyalty-specific fields. One of these fields, "loyaltyId", serves as the primary identity for the schema under the "Email" namespace. As seen under Schema Properties , this schema has been enabled for use in Real-time Customer Profile .

Hotels schema

The destination schema "Hotels" contains fields that describe a hotel, include its address, brand, number of rooms, and star rating. The "hotelId" field serves as the primary identity for the schema under the "ECID" namespace. Unlike "Loyalty Members", this schema has not been enabled for Real-time Customer Profile.

Create a relationship mixin

This step is only required if your source schema does not have a dedicated string-type field to be used as a reference to another schema. If this field is already defined in your source schema, skip to the next step of defining a relationship field .
In order to define a relationship between two schemas, the source schema must have a dedicated field to be used as a reference to the destination schema. You can add this field to the source schema by creating a new mixin.
Start by clicking Add in the Mixins section.
The Add Mixin dialog appears. From here, click Create New Mixin . In the text fields that appear, enter a display name and description for the new mixin. Click Add Mixin when finished.
The canvas reappears with "Loyalty Relationship" appearing in the Mixins section. Click the mixin name, then click Add Field next to the root-level "Loyalty Members" field.
A new field appears in the canvas under the "\_tenantId" namespace. Under Field Properties , provide a field name and display name for the field, and set its type to "String".
When finished, click Apply .
The updated "loyaltyRelationship" field appears in the canvas. Click Save to finalize your changes to the schema.

Define a relationship field for the source schema

Once your source schema has a dedicated reference field defined, you can designate it as a relationship field.
Click the reference field in the canvas, then scroll down under Field Properties until the Relationship checkbox appears. Select the checkbox to reveal the required parameters for configuring a relationship field.
Click the dropdown for Reference Schema and select the destination schema for the relationship ("Hotels" in this example). If the destination schema is union-enabled, the Reference Identity Namespace field is automatically set to the namespace of the destination schema's primary identity. If the schema does not have a primary identity defined, you must manually select the namespace that you plan to use from the dropdown menu. Click Apply when finished.
The field appears as a relationship in the canvas, displaying the name and reference identity namespace of the destination schema. Click Save to save your changes and complete the workflow.

Next steps

By following this tutorial, you have successfully created a one-to-one relationship between two schemas using the Schema Editor. For steps on how to define relationships using the API, see the tutorial on defining a relationship using the Schema Registry API .