{
    "$schema": "http://json-schema.org/draft-07/schema#",
    "definitions": {
        "directory": {
            "type": "object",
            "additionalProperties": {
                "type": "array",
                "items": {
                    "oneOf": [
                        { "type": "string" },
                        { "$ref": "#/definitions/directory" }
                    ]
                }
            }
        }
    },
    "type": "array",
    "items": { "$ref": "#/definitions/directory" }
}