为了尽可能减小“对象模型阻抗”(对象模型间转换的运行时与维护开销)，应用程序应该将供应商服务信息模型内部化。
To minimize "object model impedance" (the run time and maintenance overhead of translating between object models), applications should internalize the vendor service information model.
每当尝试查询一个空间列时，DB 2加入一个转换，该转换将内部的、结构化类型的表示转换为应用程序能理解的表示。
Whenever you try to query a spatial column, DB2 injects a transformation from the internal, structured type representation to a representation that can be understood by the application.
但应用程序最终需要将xml转换为其内部数据结构(或反向转换)，以便在应用程序内使用此数据。
But applications ultimately need to convert the XML to or from their own internal data structures to use the data within the application.
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