@Nullable
  public static DomFileElement<IdeaPlugin> getIdeaPluginFileElement(@NotNull XmlFile file) {
    return DomManager.getDomManager(file.getProject()).getFileElement(file, IdeaPlugin.class);
  }
@Nullable
  public static DomFileElement<IdeaPlugin> getIdeaPluginFileElement(@NotNull XmlFile file)