{
    "$schema": "http://json-schema.org/draft-04/schema#",
    "type": "object",
    "properties": {
        "version": {
            "oneOf": [
                {
                    "type": "string",
                    "minLength": 1,
                    "maxLength": 255
                },
                {
                    "type": "null"
                }
            ]
        },
        "slug": {
            "type": "string",
            "minLength": 4,
            "maxLength": 63,
            "pattern": "^[0-9a-z-]*$"
        }
    },
    "additionalProperties": false,
    "required": [
        "slug"
    ]
}