{
  "id": "http://yourdomain.com/schemas/myschema.json",
  "description": "Example description",
  "type": "object",
  "properties": {
    "first_name": {
      "description": "Any first name",
      "anyOf": [
        {
          "description": "A type of first name",
          "type": "string",
          "enum": ["Bob"]
        },
        {
          "description": "Another type of first name",
          "type": "string",
          "enum": ["Alice"]
        }
      ]
    }
  },
  "additionalProperties": false
}