基于 RELAX NG 模式的有效性（可以选择禁用该选项）。
Validity against the RELAX NG Schema (which can be optionally disabled)
在清单3中可以看到，部署描述符中的一些元素对应着JMS概念中的应答模式、订阅、持久性和消息选择器。
You can see in Listing 3 that some elements in the deployment descriptor correspond to the JMS concepts of acknowledge mode, subscription durability, and message selector.
但是，有了mdb触发的应用程序，事务模式就由mdb的部署描述符选择，而消息持久性由发送此消息的应用程序选择。
However, with an MDB-triggered application, the transaction mode is selected by the MDB's deployment descriptor, yet the message persistence is selected by the application that sends the message.
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