def input=(input)
      validator = EnumAttributeValidator.new('String', ["html", "xml", "auto"])
      unless validator.valid?(input)
        fail ArgumentError, "invalid value for 'input', must be one of #{validator.allowable_values}."
      end
      @input = input
    end
def input=(input)
      validator = EnumAttributeValidator.new('String', ["html", "xml", "auto"])
      unless validator.valid?(input)
        fail ArgumentError, "invalid value for 'input', must be one of #{validator.allowable_values}."
      end
      @input = input
    end
Custom attribute writer method checking allowed values (enum).
 @param [Object] input Object to be assigned