These two properties are used to control what happens when the object at each end of the relationship is copied. It is possible to copy the relationships to the objects at the other end and also to copy the objects at the other end as well, though this is not often used. The options are:
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Don’t copy object or relationship (stored in the xml file as #0)
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Copy relationship to object at the other end (stored in the xml file as #1)
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Copy object at the other end (stored in the xml file as #2)