@Override
  public void processNames(@NotNull Processor<? super String> processor, @NotNull GlobalSearchScope scope, @Nullable IdFilter filter) {
    FileBasedIndex.getInstance().processAllKeys(XsltSymbolIndex.NAME, processor, scope, filter);
  }
@Override
  public void processNames(@NotNull Processor<? super String> processor, @NotNull GlobalSearchScope scope, @Nullable IdFilter filter)