It is quite simple: There is one controlflow for each "stream" of data generated by DBGEN.
它也是简单的：存在有一个控制流为每一个“流”所产生的数据DBGEN。
2
It allows you to receive a stream of events from the parser, similar to SAX-style parsing, but with the ability to control the flow of events, by only "pulling" the ones you want.
它允许您从解析器接收事件流(类似于SAX风格的解析)，但是能够通过选择所需的事件来控制事件流。
3
All kinds of information flows are detailed, including program streamflow and control information flow, the system flow of the VOD solution is also given.