docs: public static List<String> getInstalledPlugins() {
          final List<Element> plugins = toList(getPluginConfiguration().getElementsByTagName("plugin"));
          return plugins.stream()
                  .map((Element elem) -> elem.getAttributeNode("id"))
                  .filter(Objects::nonNull)
                  .map(Attr::getValue)
                  .sorted()
                  .collect(Collectors.toList());
      }