{
    FeatureMapUtil.Validator validator = FeatureMapUtil.getValidator(owner.eClass(), feature);
    Entry [] entries = (Entry[])data;
    for (int i = 0; i < size; ++i)
    {
      Entry entry = entries[i];
      if (validator.isValid(entry.getEStructuralFeature()))
      {
        return false;
      }
    }
    return true;
  }