{ "$schema": "http://json-schema.org/draft-07/schema#", "type": "object", "properties": { "version": { "oneOf": [ { "type": "string", "minLength": 1, "maxLength": 255 }, { "type": "null" } ] }, "slug": { "type": "string", "minLength": 3, "maxLength": 63, "pattern": "^[0-9a-z-]*$" } }, "additionalProperties": false, "required": [ "slug" ] }