这种命名策略可以应用于任何类型的嵌套逻辑环境，而不只是程序单元环境。
This naming strategy can be applied to any type of nested logical contexts, not just program unit contexts.
为了高效地管理XML数据，像传统的SQL数据类型一样，DB 2在内部使用XML数据模型作为逻辑数据模型，同时也作为物理存储的基本单元。
To efficiently manage XML data, like traditional SQL data types, DB2 USES the XML data model internally, as the logical data model and as the fundamental unit of physical storage.
一个单元确认器包含了确认单个类型单元的逻辑，它被分解为功能与属性确认器。
A unit validator contains logic that validates a single type of unit and is broken into capability and attribute validators.
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