结构表说明了处理程序需要在各个层次上如何处理外来元素。
The structure table shows how the processor must handle foreign elements at each level.
尤其是，通过使用分派表，可以按照非常清晰且可维护的方式处理许多不同结构的元素类型。
In particular, use of dispatch tables makes it possible to deal with many differently structured element types in a very clear and maintainable way.
在理论上，在必须执行表结构重组之前，SQL和RDBMS只能处理某种程度的松散耦合。
In theory, there is only a certain level of loose coupling that SQL and RDBMS can cope with before table structure reorganization must occur.
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