{
    "$schema": "http://json-schema.org/draft-07/schema#",

    "definitions": {
        "person": {
            "type": "object",
            "properties": {
                "name": { "type": "string" },
                "children": {
                    "type": "array",
                    "items": { "$ref": "#/definitions/person" },
                    "default": []
                }
            }
        }
    },

    "type": "object",

    "properties": {
        "person": { "$ref": "#/definitions/person" }
    }
}