The sample of wiki for Mutually Exclusive Options at https://github.com/gsscoder/commandline/wiki/Mutually-Exclusive-Options is already helpful. But it would be great to be able to define options as members of multiple sets, e.g. ``` C# [Option(SetName = "ftp, www")] public string NewServiceUrl { get; set; } ``` which requires NewServiceUrl as argument as soon as other ftp or other www arguments are specified. (Or is it already implemented but I haven't realized it/the wiki doesn't tell?)