信息集合和行动贡献指定一个包含贡献细节的被关联的 .xml 文件。
The infoset and actions contributions specify an associated .xml file that contains the details of the contribution.
如果被关联的类是final的，Hibernate会一次加载所有内容，这对性能会有影响。
If your associated classes are final, Hibernate has to eagerly load all of them, which hurts performance.
这种方法的一个局限在于所有被关联的内容都在得出的结果过程中以“只读”的形式出现，它们不能够被直接修改。
One limitation of this method is all linked content appears in the resulting process as "read-only" and cannot be modified directly.
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