private @Nullable Map<String, Void> getIds(@NotNull CharSequence content) {
    if (!StringUtil.contains(content, JavaFxNamespaceDataProvider.JAVAFX_NAMESPACE)) {
      return null;
    }

    final Map<String, Void> map = new HashMap<>();
    final IXMLBuilder handler = createParseHandler(map);
    try {
      NanoXmlUtil.parse(new CharSequenceReader(content), handler);
    }
    catch (StopException ignore) {}
    return map;
  }
private @Nullable Map<String, Void> getIds(@NotNull CharSequence content)