Input schema definition for Serverless Workflow

The dataInputSchema in the Serverless Workflow specification is a parameter used in the workflow definition. The dataInputSchema parameter validates the workflow data input against a defined JSON Schema. It is important to provide dataInputSchema, as it is used to verify if the provided workflow data input is correct before any workflow states are executed.

You can define a dataInputSchema as follows:

In the previous definition, the schema property is a URI, which holds the path to the JSON schema used to validate the workflow data input. The URI can be a classpath URI, a file, or an HTTP URL. If a classpath URI is specified, then the JSON schema file must be placed in the resources section of the project.

You can see the serverless-workflow-expression-quarkus example application of a workflow definition with dataInputSchema. See the Serverless Workflow JSON file for more details.

When a workflow definition contains a dataInputSchema attribute, the workflow application generates an OpenAPI file, such as http://localhost/q/openapi. The generated OpenAPI file references the schema file, which helps in defining the input data for the workflows. For more information about the OpenAPI file, see OpenAPI specification.

If you want to generate an OpenAPI file for a workflow, then you must add the Quarkus dependency in the project.