@Override
  public void registerReferenceProviders(@NotNull PsiReferenceRegistrar registrar) {
    ElementPattern<XmlTag> pattern = xmlTag().withParent(DomPatterns.tagWithDom("properties", DomPatterns.domElement(MavenDomProperties.class)));
    registrar.registerReferenceProvider(pattern, new MavenPropertyPsiReferenceProvider(), PsiReferenceRegistrar.DEFAULT_PRIORITY);
  }
@Override
  public void registerReferenceProviders(@NotNull PsiReferenceRegistrar registrar)