void (@NotNull final PsiReferenceRegistrar registrar) { final JavaClassListReferenceProvider classListProvider = new JavaClassListReferenceProvider(); registrar.registerReferenceProvider(xmlAttributeValue(), classListProvider, PsiReferenceRegistrar.LOWER_PRIORITY); registrar.registerReferenceProvider(xmlTag(), classListProvider, PsiReferenceRegistrar.LOWER_PRIORITY); }