从第一个正则表达式开始，创建一个来自数据文件的记录数组，然后循环执行其余的正则表达式以改进结果。
Starting with the first regular expression, create an array of records from the data file, then loop through the remaining regular expressions to refine the results.
SQL假设查询内的每一个表达式都返回一个行和列的数组，而XML数据的异构本质与之相冲突。
The heterogeneous nature of XML data conflicts with the SQL assumption that every expression inside a query returns an array of rows and columns.
虽然保留最初的查询词数组不动，但是为每个词构建了正则表达式。
While leaving the original query words array intact, we build a regular expression for each word.
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