第一个分隔符必须为 BEGIN TRANSACTION 或 BEGIN DISTRIBUTED TRANSACTION，而结束分隔符必须为下列之一： COMMIT TRANSACTION COMMIT WORK ROLLBACK TRANSACTION ROLLBACK WORK SAVE TRANSACTION。
但是，在使用ObjectContainer上的commit方法提交显式事务之前，它不会进行实际更新。
It doesn't do the actual update until the implicit transaction is committed, however, using the commit method on the ObjectContainer.
JMS客户端可以任意的显式控制该事务，比如在同一个消息传递系统中，协同处理从一个队列接收消息和向另一个队列发送消息。
The JMS client can optionally control this transaction explicitly, such as to coordinate receiving a message from one queue with sending a message on another queue in the same messaging system.
因此，流程描述本身将不会显式利用规范中列出的协调和事务服务。
Thus, the process description itself will not explicitly utilize the coordination and transaction services outlined within the specifications.
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