映射XML文件，描述如何将EJB中的属性映射到数据库模式中的列。

The map XML file that describes how the attributes in the EJBs are mapped to columns in the database schema.

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模式XML文件，描述EJB将要映射到的数据库模式。

The schema XML file that describes the database schema that the EJB will be mapped to.

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XML 映射文件描述了如何将类映射到数据库中具体的表，并描述了类与其他类的关系。

XML mapping files describe how a class maps to a particular table in the database, along with any relationships that the class has with other classes.

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