3.4.1 嵌套对象 O r a c l e 8 i支持嵌套对象(Nested Object)的概念。用create type命令能创建另外的数据类型，并 在其他对象中引用它们。
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nested object oriented structure 嵌套面向对象结构
Nested object members incur significant performance impact and should be minimized.
嵌套对象成员会造成重大性能影响，尽量少用。
This means that entire frameworks which use the nested object name-spacing are making their library bigger and slower.
这就意味着如果一个框架使用嵌套对象命名空间，那么它的库将会庞大而且缓慢。
This is especially important when dealing with nested object members that have a more dramatic effect on execution speed.
在处理嵌套对象成员时这点特别重要，它们会对运行速度产生难以置信的影响。
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