How can aggregation be mapped in OCM?

[Dan Connelly]

How do you express aggregated, not contained, bean references in the OCM?  

An aggregate bean ref would (presumably) get persisted as a uuid uri, 
not as a content sub-node.    (Path references might be okay instead of 
uuids.)

If I map naively with two classes that where each has the other as a 
bean element, then pm.insert(rootObj) will traverse this loop 
endlessly.   The rootObj class has proper containment of both these 
mutually referencing classes.

      -- Dan