@Override
  public void registerReferenceProviders(final @NotNull PsiReferenceRegistrar registrar) {
    GenericValueReferenceProvider provider = new GenericValueReferenceProvider();

    registrar.registerReferenceProvider(XmlPatterns.xmlTag(), provider);
    registrar.registerReferenceProvider(XmlPatterns.xmlAttributeValue(), provider);
  }
@Override
  public void registerReferenceProviders(final @NotNull PsiReferenceRegistrar registrar)