We found a bigger difference for queries that touch a large number of rows, such as a table scan over all 20,000 XML documents with string comparison on every document.

我们发现涉及大量行的查询的性能差异比较大，比如对所有20,000个XML文档进行全表扫描并对每个文档比较字符串。

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The root or global space is considered empty and each time the module keyword is encountered during a file scan the string ": :" and the identifiers are appended to the name of the current root.

根或全局空间被认为是空的，文件扫描中每次遇到模块关键字时，字符串“：”和其标识都会附加到当前根的名称后面。

youdao

Replacing Spaces with commas and vice versa can be done in a single scan over the string, and the control characters are injected at the same time.

只需对字符串扫描一次，就可以用逗号替换空格，反之亦然，同时还可以加入控制字符。

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