如何访问不同数据源类型的数据在IT业界变得越来越重要，SDO是一种应用程序编程接口(API)，可以简化和统一对异构数据的访问。

SDO is an API (application programming interface) that helps simplify and unify data access across different data source types, which is becoming more and more crucial in the IT industry.

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XQJ是一个通用的XQuery数据访问框架，它在许多不同的XQuery实现之上提供了一个统一的接口。

XQJ is a generic XQuery data access framework, which provides a uniform interface on top of a variety of different XQuery implementations.

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PDO并不是类似于PearDB的数据库抽象层，而更像一种采用了统一api(应用编程接口)的数据访问层。

PDO is not an abstraction layer like PearDB. PDO is a more like a data access layer which USES a unified API (Application Programming Interface).

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