public ElementFilter getIdForFilter() {
    return new ElementFilter() {
      @Override
      public boolean isAcceptable(Object element, PsiElement context) {
        final PsiElement grandParent = ((PsiElement)element).getParent().getParent();
        if (grandParent instanceof XmlTag tag) {

          if (!tag.getNamespacePrefix().isEmpty()) {
            return true;
          }
        }
        return false;
      }

      @Override
      public boolean isClassAcceptable(Class hintClass) {
        return true;
      }
    };
  }
public ElementFilter getIdForFilter()