{
    "$schema": "http://json-schema.org/draft-07/schema#",
    "type": "object",
    "properties": {
        "header": {
            "type": "object",
            "properties": {
                "school": {
                    "type": "string"
                },
                "city": {
                    "type": "string"
                },
                "year": {
                    "type": "string"
                },
                "semester": {
                    "type": "string"
                },
                "subject": {
                    "type": "string"
                },
                "level": {
                    "type": "string"
                },
                "publisher": {
                    "type": "string"
                },
                "class": {
                    "type": "string"
                },
                "group": {
                    "type": "string"
                },
                "profile": {
                    "type": "string"
                },
                "max_points": {
                    "type": "integer"
                },
                "teacher": {
                    "type": "string"
                }
            },
            "required": [
                "school",
                "city",
                "year",
                "semester",
                "subject",
                "class",
                "group",
                "profile",
                "teacher"
            ]
        },
        "students": {
            "type": "array",
            "items": {
                "type": "object",
                "properties": {
                    "id": {
                        "type": "integer"
                    },
                    "first_name": {
                        "type": "string"
                    },
                    "last_name": {
                        "type": "string"
                    },
                    "name": {
                        "type": "string"
                    },
                    "grade": {
                        "type": [
                            "string",
                            "null"
                        ]
                    },
                    "points": {
                        "type": [
                            "number",
                            "null"
                        ]
                    },
                    "status": {
                        "type": "integer"
                    }
                },
                "required": [
                    "id",
                    "first_name",
                    "last_name",
                    "name",
                    "grade",
                    "status"
                ]
            }
        }
    },
    "required": [
        "header",
        "students"
    ]
}