@Override
  @NotNull
  public String getEpPrefix() {
    String prefix = getDefaultExtensionNs().getStringValue();
    if (prefix == null) {
      final IdeaPlugin ideaPlugin = getParentOfType(IdeaPlugin.class, true);
      prefix = ideaPlugin == null ? null : StringUtil.notNullize(ideaPlugin.getPluginId(), DEFAULT_PREFIX);
    }
    if (prefix == null) {
      prefix = getXmlns().getStringValue();
    }
    return prefix != null ? prefix + "." : "";
  }
@Override
  @NotNull
  public String getEpPrefix()