{
    "$schema": "https://json-schema.org/draft/2020-12/schema",
    "$id": "https://vufind.org/marc.schema.json",
    "title": "MARC-in-JSON",
    "description": "A MARC record in JSON format",
    "type": "object",
    "properties": {
        "leader": {
            "type": "string",
            "minLength": 24,
            "maxLength": 24
        },
        "fields": {
            "type": "array",
            "items": {
                "anyOf": [
                    {
                        "type": "object",
                        "description": "A MARC Control Field",
                        "additionalProperties": {
                            "type":"string"
                        }
                    },
                    {
                        "type": "object",
                        "additionalProperties": {
                            "type":"object",
                            "description": "A MARC Variable Field",
                            "properties": {
                                "ind1": {
                                    "type": "string",
                                    "minLength": 1,
                                    "maxLength": 1
                                },
                                "ind2": {
                                    "type": "string",
                                    "minLength": 1,
                                    "maxLength": 1
                                },
                                "subfields": {
                                    "type": "array",
                                    "items": {
                                        "type": "object",
                                        "description": "A MARC Subfield",
                                        "additionalProperties": {
                                            "type": "string"
                                        }
                                    }
                                }
                            }
                        }
                    }
                ]
            },
            "additionalProperties": false
        }
    },
    "additionalProperties": false
}