@Override
  public void storeToXML(OutputStream os, String comment) throws IOException {
    if (interned != null) interned.storeToXML(os, comment);
    else super.storeToXML(os, comment);
  }
**********   Public API of java.util.Properties   ***********
common/src/java/org/apache/hadoop/hive/common/CopyOnFirstWriteProperties.java