@Override
  public void save(final DataOutput out) {
    try {
      super.save(out);
      DataInputOutputUtil.writeINT(out, myFileName);
      RW.save(myUsages, UsageRepr.externalizer(myContext), out);
    }
    catch (IOException e) {
      throw new BuildDataCorruptedException(e);
    }
  }
@Override
  public void save(final DataOutput out)