显然，它应该防止无限循环，而且它应该检测以前装载的对象并通过重用这些对象来节省时间。
Obviously, it should prevent never-ending loops, and it should detect previously loaded objects and save time by reusing them.
不要通过重新装载表定义覆盖db 2 stage中的输入列，否则前面X ML输入stage中的XPath将丢失。
DO NOT override the input columns in DB2 stages by reloading table definitions, otherwise the XPath in the foregoing XML input stage will be lost.
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