选择器：加载用来确认文件或数据块的一个规则列表。
Selector: a list of rules to identify files or chunks used by a load.
现在我们加载了业务规则，也为每条规则构造好了Erlang函数，是时候把市场数据参数传给它们了。
Now that we have loaded our business rules and built Erlang functions for each of them, it is time to apply market data arguments to them.
优先排序器：应用于数据块与加载以确定处理顺序的一个规则与优先级列表。
Prioritizer: a list of rules and priorities applied to chunks and loads to determine order of processing.
将数据的转换阶段单独分离出来，同时提供数据转换重用机制，将那些可以重用的规则保存下来以便于日常增量数据的定时抽取、转换及加载；
The data transform stage is separated, while provides data transform reuse mechanisms, who may save the rules and use its for extracting the daily incremental data, transform and loading;
将数据的转换阶段单独分离出来，同时提供数据转换重用机制，将那些可以重用的规则保存下来以便于日常增量数据的定时抽取、转换及加载；
The data transform stage is separated, while provides data transform reuse mechanisms, who may save the rules and use its for extracting the daily incremental data, transform and loading;
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