db.open(databaseName, Database.OPEN_READ_WRITE);
Transaction tx = odmg.newTransaction();
tx.begin();
DMap map = odmg.newDMap();
PersistenceBroker broker = ((HasBroker) tx).getBroker();
String name = null;
try
{
// name = "the_dmap_" + (broker.getUniqueId(DMapImpl.class, "id") - 1);