using System.ComponentModel.DataAnnotations; namespace RobotApp.VDA5050.Factsheet; public class Envelopes3d { [Required] public string Set { get; set; } = string.Empty; [Required] public string Format { get; set; } = string.Empty; public object Data { get; set; } = string.Empty; public string Url { get; set; } = string.Empty; public string Description { get; set; } = string.Empty; }