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Nomenclature:

A leaf is a check-in with no descendants.
An open leaf is a leaf that does not have a "closed" tag and is thus assumed to still be in use.
A closed leaf has a "closed" tag and is thus assumed to be historical and no longer in active use.

Open leaves:

2009-12-15
17:38:04	*	[232bef4e45] Leaf clarified behaviour of db handle when Database::Open() fails (user: stephan, tags: trunk)