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ZenRelations
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ZenRelations product allows zope objects to form bi-directional relationships.

There are 4 different types of relationship:

ONE_TO_ONE - only one object at each end of the relationship

ONE_TO_MANY - classic parent child relation, not containment objects have
    different primary paths

ONE_TO_MANY_CONT - standard zope one to many containment relation (but
    bidirectional)

MANY_TO_MANY - many objects on both ends of relationship


Copy and Paste in the ZMI
