@Override
  public void loadState(@NotNull Element state) {
    myIgnoredUnknownFeatures.clear();
    for (Element element : state.getChildren()) {
      String featureType = element.getAttributeValue(FEATURE_ID);
      if (featureType == null) continue;

      String implementationName = element.getAttributeValue(IMPLEMENTATION_NAME);
      if (implementationName == null) continue;

      myIgnoredUnknownFeatures.add(new UnknownFeature(featureType, implementationName));
    }
  }
@Override
  public void loadState(@NotNull Element state)