{
    "$schema": "http://json-schema.org/draft-07/schema#",
    "definitions": {
        "frequency": {
            "oneOf": [
                {
                    "type": ["string", "number"]
                },
                {
                    "type": "object",
                    "additionalProperties": false,
                    "required": [
                        "value"
                    ],
                    "properties": {
                        "value": {
                            "type": "number"
                        },
                        "displayValue": {
                            "type": "string"
                        }
                    }
                }
            ]
        }
    },
    "type": "array",
    "description": "Custom metadata for kanji characters.",
    "items": {
        "type": "array",
        "description": "Metadata about a single kanji character.",
        "minItems": 3,
        "additionalItems": false,
        "items": [
            {
                "type": "string",
                "minLength": 1
            },
            {
                "type": "string",
                "enum": ["freq"],
                "description": "Type of data. \"freq\" corresponds to frequency information."
            },
            {
                "$ref": "#/definitions/frequency",
                "description": "Data for the character."
            }
        ]
    }
}