如何在Flutter中对HttpClient流中的XML元素进行分组

import 'package:http/http.dart' as http;
import 'package:xml/xml.dart' as xml;

http.Client client = http.Client();
http.Request request = http.Request('GET', Uri.parse('https://example.com/xml-data'));
http.StreamedResponse response = await client.send(request);

String responseBody = await response.stream.bytesToString();

xml.XmlDocument document = xml.parse(responseBody);

List<xml.XmlElement> elements = document.findAllElements('elementName').toList();

Map<String, List<xml.XmlElement>> groupedElements = {};
for (xml.XmlElement element in elements) {
  String groupKey = element.getAttribute('groupAttribute');
  if (!groupedElements.containsKey(groupKey)) {
    groupedElements[groupKey] = [];
  }
  groupedElements[groupKey].add(element);
}