Michael Trier committed 8de9028

Corrected problem in docstring.

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           to "False", which means the default cascade should be used.
           The default value is "save-update, merge".
           Available cascades are:
             save-update - cascade the "add()" operation 
             (formerly known as save() and update())
             merge - cascade the "merge()" operation
             expunge - cascade the "expunge()" operation
             delete - cascade the "delete()" operation
             delete-orphan - if an item of the child's type with no parent is detected,
             mark it for deletion.  Note that this option prevents a pending item
             of the child's class from being persisted without a parent 
             refresh-expire - cascade the expire() and refresh() operations
             all - shorthand for "save-update,merge, refresh-expire, expunge, delete"