public Validation <Error, CreateEntityTypeCommand> ValidateCreateEntityTypeCommand(CreateEntityTypeCommand cmd)
 => from x in ValidateNonNull(cmd)
 from y in (ValidateEntityTypeName(x.Name),
 public Try <Validation <Error, EntityTypeDto> > Execute(CreateEntityTypeCommand cmd)
 => ()
 => from x in ValidateCreateEntityTypeCommand(cmd)
 let y                 = CreateEntityTypeFrom(cmd)
                 let z = repository.Create(y)
                         select z.ToTipoEntidadDTO();