code: def multiChoiceParam(parameters, name, type_converter = str):
      
      param = parameters.find(".//MultiChoiceParam[@Name='{name}']".format(name=name))
      value = param.find('Value')
      values = param.find('Values')
      return [type_converter(values[int(item.text)].text) for item in value.findall('Item')]
docs: multi choice parameter values.
      :param parameters: the parameters tree.
      :param name: the name of the parameter.
      :param type_converter: function to convert the chosen value to a different type (e.g. str, float, int). default = 'str'
      :returns dictionary: value -> values