What's the best way to handle multi-level table object?

[Yu, Jack]

In one of our environment, some stored proc uses multiple level table
objects, such as:

TopLevelTable Obj is table of TopLevelObj.
Then in TopLevelObj, it contains variables which is table of some other
objects.

In this kind of multi-level table environment, seems I have to assign
values to individual objects in different value. Seems to me that I
couldn't use the benefits of iBatis. 

Any suggestions?

Thank you.

-- Jack