Defining schema components

Schema components define reusable schemas that provide developers with information about the request they should make, or the response they should expect to receive, when calling an API operation.

About this task

  • This task relates to configuring an OpenAPI 3.0 API definition. For details on how to configure an OpenAPI 2.0 API definition, see Editing an OpenAPI 2.0 API definition.
  • OpenAPI 3.0 APIs are supported only with the DataPower® API Gateway, not with the DataPower Gateway (v5 compatible).
  • For details of current OpenAPI 3.0 support limitations, see OpenAPI 3.0 support in IBM® API Connect.

You can complete this task either by using the API Designer UI application, or by using the browser based API Manager UI.

To make use of a schema component, you reference it from elsewhere in your API definition. You can reference a schema from the following locations:

At any time, you can switch directly to the underlying OpenAPI YAML source that corresponds to the design form in the user interface by clicking the Source icon OpenAPI Source icon. To return to the design form, click the Form icon Form icon.


  1. Open the required API for editing, as described in Editing an OpenAPI 3.0 API definition.
  2. Expand Components then, if there are already one or more schemas components defined, expand Schemas.
  3. You can create a new schema component, or edit any existing schema component.
    • To create a schema component, click the add icon OpenAPI 3.0 API add icon alongside Schemas, then refer to Creating a schema.
    • To edit an existing schema component, click the schema component name in the navigation pane, then refer to Editing a schema.