请教Informix中Object-relational模式问题

[howard88]

小第正在用Informix Dynamic 2000 做一个Image contents based database.
可能要用到Object-relational模式，但是它不象关系型那样容易modelling.
请问如何建模？数据模型大致如下：

Image and Boundary
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image and ImageAttribute and BoundaryAttribute1 and Boundary Attribute2 and
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image1 and 1 and X and a and
and and Y and b and
and and Z and c and
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image2 and 2 and L and d and
and and P and e and
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image3 and 3 and K and f and
and and I and g and
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说明：
每个image有很多boundary, 但不同的image，boundary 数目也不同。每个image都有唯一的标识符。（我没有办法做成一般的关系型表结构）。

非常感谢各位大侠的帮忙！不胜感谢！