code: protected synchronized void serialize(XAttributeMap map) throws IOException {
  		storage.seek(0);
  		serializer.serialize(map, storage);
  		cacheMap = new WeakReference<XAttributeMap>(map);
  		this.size = map.size();
  		map = null;
  	}
docs: Serializes the given attribute map to a disk-buffered representation.
  
  @param map Attribute map to be serialized.