此步骤需要一个缺省服务分类，用于分配未知优先级类型的消息。

This step requires a default service class, for which messages of unknown priority type can be assigned.

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每个服务区域将具有运行于其中的mdb实例，并基于消息优先级类型处理(使用)来自mq队列的消息。

Each servant region will have instances of the MDBs running within it and process (consume) messages from the MQ queue based on the messages priority type.

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下一步，我们将为工作负载分类XML文件中定义的每种消息优先级类型(GOLD、SILVER、BRONZE)的事务分类创建一个服务分类。

Next we create a service class for each message priority type's (GOLD, SILVER, BRONZE) transaction class defined in the workload classification XML file.

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