Validation <Error, UpdateAnnotationTypeCommand> ValidateUpdateAnnotationTypeCommand(UpdateAnnotationTypeCommand cmd)
 => from x in ValidateNonNull(cmd)
 from y in (
 public Try <Validation <Error, AnnotationTypeDto> > Execute(UpdateAnnotationTypeCommand cmd)
 => ()
 => from x in ValidateUpdateAnnotationTypeCommand(cmd)
 let y                 = x.ToAnnotationType()
                 let z = _repository.Update(y)
                         select z.ToAnnotationTypeDto();