[ZDP] BackTalk to Document Zope Developer's Guide (2.4 edition)/ZODB Persistent Components

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A comment to the paragraph below was recently added via http://www.zope.org/Documentation/Books/ZDG/current/Persistence.stx#2-31

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    There are two solutions to this problem.  First, you can assign a
    special flag, '_p_changed'::

        def addDepartment(self, department):
            self.department.append(department)
            self._p_changed = 1

      % Anonymous User - Mar. 24, 2003 4:23 pm:
       It says there are "two solutions", and then, "First...". What is the second solution?