def nested_list_from_xml_string(xml, container_element_name, list_element_name = default_list_element_name)
        xml_doc = Nokogiri::XML(xml)
        nested_list_from_xml_doc(xml_doc.at_xpath("./#{container_element_name}"), list_element_name)
      end
def nested_list_from_xml_string(xml, container_element_name, list_element_name = default_list_element_name)
        xml_doc = Nokogiri::XML(xml)
        nested_list_from_xml_doc(xml_doc.at_xpath("./#{container_element_name}"), list_element_name)
      end
nested parsing for api methods that return standard object inside containers with no additional (useful) information
e.g. tagged_item.artist, recommendation.release, search_result.track, etc