{
    "properties": {
        "ID": {
            "maxLength": 8,
            "minLength": 4,
            "type": "string"
        },
        "age": {
            "maximum": 100,
            "minimum": 16,
            "multipleOf": 4,
            "type": "integer"
        },
        "grades": {
            "items": {
                "type": "integer"
            },
            "maxItems": 5,
            "minItems": 2,
            "type": "array",
            "_uniqueItems": true
        },
        "item": {
            "minLength": 2,
            "pattern": "^[a-zA-Z]+$",
            "type": "string"
        }
    },
    "required": [
        "ID",
        "age",
        "grades",
        "item"
    ],
    "type": "object"
}