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+This package contains a generic transaction implementation for Python.
+It is mainly used by the ZODB, though.
+
+Note that the data manager API, transaction.interfaces.IDataManager, is
+syntactically simple, but semantically complex. The semantics were not
+easy to express in the interface. This could probably use more work. The
+semantics are presented in detail through examples of a sample data
+manager in transaction.tests.test_SampleDataManager.