{
    "$schema": "http://json-schema.org/draft-04/schema#",
    "type": "object",
    "required": [
        "meta"
    ],
    "properties": {
        "meta": {
            "required": [
                "format_version"
            ],
            "properties": {
                "format_version": {
                    "type": "integer",
                    "minimum": 1
                }
            },
            "additionalProperties": {
                "type": "object",
                "required": [
                    "modified",
                    "hostname"
                ],
                "properties": {
                    "modified": {
                        "type": "string",
                        "format": "date-time"
                    },
                    "hostname": {
                        "type": "string",
                        "format": "hostname"
                    }
                }
            }
        }
    }
}