protected boolean skipName(Name definedName) {
    String namename = definedName.getNameName();
    if (namename == null) {
      return true;
    }
    // ignore defined name of functions, they are macro functions that we don't support
    if (definedName.isFunctionName()) {
      return true;
    }

    if (definedName.getRefersToFormula()
        == null) { // ignore defined name with null formula, don't know when will have this case
      return true;
    }

    return false;
  }