@Override
  protected @NotNull Pair<TextRange, PsiElement> computeProblemRange() {
    final PsiReference reference = myReference;
    PsiElement element = reference.getElement();
    if (element instanceof XmlAttributeValue && element.getTextLength() == 0) return NO_PROBLEM;
    TextRange referenceRange = reference.getRangeInElement();
    return Pair.create(referenceRange, element);
  }
@Override
  protected @NotNull Pair<TextRange, PsiElement> computeProblemRange()