除记录组织的当前事件外，一个业务级的序列图能被当作一个需求文件使用，为实现一个未来系统传递需求。
Besides documenting an organization's current affairs, a business-level sequence diagram can be used as a requirements document to communicate requirements for a future system implementation.
如果记录序列由于某种原因而决定必须释放空间，则可以随时激发该事件。
The event can be fired at any time when the record sequence decides that it must free up space, for any reason.
可以在记录序列空间不足时激发此事件。
You can fire this event when the record sequence has run out of space.
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