{
  "type": "object",
  "properties": {
    "send_email": {
      "type": "boolean",
      "description": "Whether to notify by email."
    },
    "send_sms": {
      "type": "boolean",
      "description": "Whether to notify by SMS."
    }
  },
  "required": [
    "send_email",
    "send_sms"
  ],
  "additionalProperties": false,
  "not": {
    "properties": {
      "send_email": {
        "const": true
      },
      "send_sms": {
        "const": true
      }
    },
    "required": [
      "send_email",
      "send_sms"
    ]
  }
}