Essentially, PersistenceManager is the main interface to the JDO persistence system.
基本上，PersistenceManager是JDO持久性系统的主接口。
When the entire document is parsed, you persist each object in the List with the PersistenceManager.
当整个文件被解析时，您使用PersistenceManager持久化List中的每个对象。
The PersistenceManager contains generic methods to persist each of the entities in the business model.
PersistenceManager类包含了持久化业务模型中的每一个实体的一般函数。
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