在本例的第一部分，通过构建JPA实体与JPA Manager Beans，您将构建您的数据层，以和备份Derby数据库相交流。

In the first part of this example, you will build your data layer by creating JPA entities and JPA Manager Beans to interact with your backend Derby database.

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针对地理实体在精简过程中遇到的相交关系一致性维护问题，提出了一种新的处理策略。

A novel strategy is presented to solve the consistency problem of maintaining intersection relation among spatial entities in map simplification.

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针对相交特征自动识别较为困难的问题，提出一种新的三维实体模型相交特征识别方法。

As it is hard to recognize intersecting features automatically, a new method to recognize such intersecting features in 3d solid model was proposed.

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