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Nomenclature:

A
leaf
is a check-in with no descendants in the same branch.
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		[232bef4e45] Leaf: clarified behaviour of db handle when Database::Open() fails (user: stephan, tags: trunk)