{
    "$schema": "http://json-schema.org/draft-07/schema#",
    "definitions": {
        "frequency": {
            "oneOf": [
                {
                    "type": ["string", "number"]
                },
                {
                    "type": "object",
                    "additionalProperties": false,
                    "required": [
                        "value"
                    ],
                    "properties": {
                        "value": {
                            "type": "number"
                        },
                        "displayValue": {
                            "type": "string"
                        }
                    }
                }
            ]
        }
    },
    "type": "array",
    "description": "Custom metadata for terms.",
    "items": {
        "type": "array",
        "description": "Metadata about a single term.",
        "minItems": 3,
        "additionalItems": false,
        "items": [
            {
                "type": "string",
                "description": "The text for the term."
            },
            {
                "type": "string",
                "enum": ["freq", "pitch"],
                "description": "Type of data. \"freq\" corresponds to frequency information; \"pitch\" corresponds to pitch information."
            },
            {
                "description": "Data for the term."
            }
        ],
        "oneOf": [
            {
                "items": [
                    {},
                    {"enum": ["freq"]},
                    {
                        "oneOf": [
                            {
                                "$ref": "#/definitions/frequency",
                                "description": "Frequency information for the term."
                            },
                            {
                                "type": ["object"],
                                "required": [
                                    "reading",
                                    "frequency"
                                ],
                                "additionalProperties": false,
                                "properties": {
                                    "reading": {
                                        "type": "string",
                                        "description": "Reading for the term."
                                    },
                                    "frequency": {
                                        "$ref": "#/definitions/frequency",
                                        "description": "Frequency information for the term."
                                    }
                                }
                            }
                        ]
                    }
                ]
            },
            {
                "items": [
                    {},
                    {"enum": ["pitch"]},
                    {
                        "type": ["object"],
                        "description": "Pitch accent information for the term.",
                        "required": [
                            "reading",
                            "pitches"
                        ],
                        "additionalProperties": false,
                        "properties": {
                            "reading": {
                                "type": "string",
                                "description": "Reading for the term."
                            },
                            "pitches": {
                                "type": "array",
                                "description": "List of different pitch accent information for the term and reading combination.",
                                "items": {
                                    "type": "object",
                                    "required": [
                                        "position"
                                    ],
                                    "additionalProperties": false,
                                    "properties": {
                                        "position": {
                                            "type": "integer",
                                            "description": "Mora position of the pitch accent downstep. A value of 0 indicates that the word does not have a downstep (heiban).",
                                            "minimum": 0
                                        },
                                        "nasal": {
                                            "oneOf": [
                                                {
                                                    "type": "integer",
                                                    "description": "Position of a mora with nasal sound.",
                                                    "minimum": 0
                                                },
                                                {
                                                    "type": "array",
                                                    "description": "Positions of morae with nasal sound.",
                                                    "items": {
                                                        "type": "integer",
                                                        "minimum": 0
                                                    }
                                                }
                                            ]
                                        },
                                        "devoice": {
                                            "oneOf": [
                                                {
                                                    "type": "integer",
                                                    "description": "Position of a mora with devoiced sound.",
                                                    "minimum": 0
                                                },
                                                {
                                                    "type": "array",
                                                    "description": "Positions of morae with devoiced sound.",
                                                    "items": {
                                                        "type": "integer",
                                                        "minimum": 0
                                                    }
                                                }
                                            ]
                                        },
                                        "tags": {
                                            "type": "array",
                                            "description": "List of tags for this pitch accent.",
                                            "items": {
                                                "type": "string",
                                                "description": "Tag for this pitch accent. This typically corresponds to a certain type of part of speech."
                                            }
                                        }
                                    }
                                }
                            }
                        }
                    }
                ]
            }
        ]
    }
}