@Override
  public PsiReference @NotNull [] getReferencesByElement(final @NotNull PsiElement element,
                                                         @NotNull ProcessingContext context) {
    final FileReferenceSet set = new FileReferenceSet(((XmlAttributeValue)element).getValue(), element, 1, null, true);
    return set.getAllReferences();
  }
@Override
  public PsiReference @NotNull [] getReferencesByElement(final @NotNull PsiElement element,
                                                         @NotNull ProcessingContext context)