{
    "$schema": "http://json-schema.org/draft-04/schema",
    "type": "object",
    "properties": {

        "metaData": {
            "type": "object",

            "properties": {
                "gradingMode": {
                    "enum": [ "ATONCE", "NONE", "LATER" ]
                },
                "additionalProperties": false,
                "anyOf": [
                    {
                        "objectives": {
                            "type": "array",
                            "required": true,
                            "items": {
                                "type": "object",
                                "required": true,
                                "properties": {
                                    "objectiveId": {
                                        "type": "string",
                                        "required": true
                                    },
                                    "scoreMax": {
                                        "type": "number",
                                        "required": true
                                    }
                                }
                            }

                        },
                        "required": [ "ATONCE", "LATER" ]
                    },
                    {
                        "referencedItems": {
                            "type": "array",

                            "required": true
                        },
                        "required": [ "ATONCE", "LATER", "NONE" ]
                    },
                    {
                        "containedItems": {
                            "type": "array",
                            "required": true,
                            "items": {
                                "type": "object",
                                "required": true,
                                "properties": {
                                    "itemId": {
                                        "type": "string",
                                        "required": true
                                    }
                                }
                            }
                        },
                        "required": [ "ATONCE", "LATER", "NONE" ]
                    }
                ],
                "title": {
                    "type": "object",

                    "properties": {
                        "id": {
                            "type": "string"

                        },
                        "value": {
                            "type": "string"

                        },
                        "required": [ "id", "value" ]
                    }
                },
                "required": [ "title" ]
            }
        }

    }


}