In 0.8.0 and 0.9.0 beta 15, node IDs of every node are stored in the mind map file. That is superfluous.
The users who store their mind maps in CVS, Subversion, or another version control system would be glad not to see those node IDs.
AFAIK those IDs are needed to be persisted only for the nodes that are connected by connectors (AKA arrow links).
We should investigate whether we could realistically get rid of the superfluous node IDs in the mind map files.
This issue is being discussed in the following thread: