$ref: "#/$defs/event" $defs: event: type: object additionalProperties: false required: - id - date - city - country properties: id: type: string type: type: string enum: - summit - meetup - hackathon confirmed: type: boolean date: type: string days: type: number city: type: string country: type: string pattern: "^\\w{2}$" coincidence: type: string lead: type: string helpers: type: array items: type: string slots: type: number visitors: type: number optional: type: boolean links: type: object additionalProperties: false patternProperties: "^[\\w]+": type: string format: uri