# File lib/aws/core/xml/grammar.rb, line 139
        def validate_args(identifier, args)
          arity = method(identifier).arity
          if args.length > 0
            raise "#{identifier} does not accept an argument" if
              arity == 0
          else
            raise "#{identifier} requires an argument" unless
              arity == 0 || arity == -1
          end
        end