# File lib/aws/core/xml_grammar.rb, line 182
        def add_method method_name, &block
          format_value do |value|
            MetaUtils.extend_method(value = super(value), method_name, &block)
            value
          end
  #           different strategey, slightly different behavior
  #           element(method_name.to_s) do
  #             format_value(&block)
  #             force
  #           end
        end