一个客户端可以向服务器请求持久化对象，然后服务器以分离对象图的方式将它们返回。
A client can request persistent objects from the server, and the server sends them as a graph of detached objects.
如果文档没有被解析且对象在30秒内进行持久化，则服务器将抛出一个异常且对象将不会创建。
If the document is not parsed and the objects made persistent within 30 seconds, then the server will throw an exception and the objects will not be created.
这些对象像标准对象一样被填充，然后以 XML 形式被串行化到服务器，进行持久化。
These objects are populated like normal objects, then serialized as XML to the server for persistence.
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