Mon, 19 Jun 2006 13:44:06 +0000Improvement:
deba [Mon, 19 Jun 2006 13:44:06 +0000] rev 2101
Improvement:

The item sets are written in the order sorted by the labels.

It solves the problem if we read a graph from a file and
then write it back then the nodes will be reversed.
It can be switched off with the LemonWriter interface.