{
    "$schema": "http://json-schema.org/schema#",
    "definitions": {
        "root-category": {
            "type": "object",
            "additionalProperties": false,
            "properties": {
                "type": {
                    "required": true,
                    "type": {
                        "enum": [
                            "category"
                        ]
                    }
                },
                "title": {
                    "type": "string",
                    "minLength": 1
                },
                "url": {
                    "type": "string",
                    "format": "uri"
                },
                "description": {
                    "type": "string",
                    "minLength": 1
                },
                "children": {
                    "type": "array",
                    "minItems": 1,
                    "oneOf": [
                        {
                            "items": {
                                "$ref": "#/definitions/category"
                            }
                        },
                        {
                            "items": {
                                "$ref": "#/definitions/link"
                            }
                        }
                    ]
                }
            }
        },
        "category": {
            "type": "object",
            "additionalProperties": false,
            "properties": {
                "type": {
                    "required": true,
                    "type": {
                        "enum": [
                            "category"
                        ]
                    }
                },
                "title": {
                    "required": true,
                    "type": "string",
                    "minLength": 1
                },
                "url": {
                    "type": "string",
                    "format": "uri"
                },
                "description": {
                    "type": "string",
                    "minLength": 1
                },
                "children": {
                    "type": "array",
                    "minItems": 1,
                    "oneOf": [
                        {
                            "items": {
                                "$ref": "#/definitions/category"
                            }
                        },
                        {
                            "items": {
                                "$ref": "#/definitions/link"
                            }
                        }
                    ]
                }
            }
        },
        "link": {
            "type": "object",
            "additionalProperties": false,
            "properties": {
                "type": {
                    "required": true,
                    "type": {
                        "enum": [
                            "link"
                        ]
                    }
                },
                "title": {
                    "required": true,
                    "type": "string",
                    "minLength": 1
                },
                "url": {
                    "required": true,
                    "type": "string",
                    "format": "uri"
                },
                "description": {
                    "type": "string",
                    "minLength": 1
                },
                "children": {
                    "type": "array",
                    "minItems": 1,
                    "items": {
                        "$ref": "#/definitions/link"
                    }
                }
            }
        }
    },
    "$ref": "#/definitions/root-category"
}