研究数据集成中的布尔查询的改写问题。
The problem of rewriting for Boolean query in data integration systems is addressed.
搜索模块中：首先，给出了搜索器的布尔查询方案。
Search module: Firstly, give out the Boolean query strategy of the searcher.
确定事件具体类型的另一种方法是使用为此提供的布尔查询方法。
Another way to determine the concrete type of the event is to use one of the Boolean query methods provided for this purpose.
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