An important feature of services in SOA is that they have descriptions that state clearly what they do and how to interact with them.
SOA当中的服务有一个重要的特性，它们的描述中清楚的陈述了它们会做什么以及如何与它们交互。
2
Recoverable processes can store two types of information: transaction state information and descriptions of changes to data.
可恢复流程可以存储两种类型的信息：事务状态信息和数据更改描述。
3
You see descriptions of each of the states, followed by the events supported by the state machine. After each event, you see a series of transitions that each event will fire.