{
  "additionalProperties": false,
  "description": "Indicates that the 'Workflow' must support the 'valueFrom' field of 'WorkflowStepInput'.",
  "properties": {
    "class": {
      "description": "CWL requirement class specification.",
      "enum": [
        "StepInputExpressionRequirement"
      ],
      "type": "string"
    }
  },
  "title": "StepInputExpressionRequirement",
  "type": "object"
}