如您所预料的，第一个子例程读取XML文件，返回一个引用。

As you might expect, the first reads an XML file, returning a reference.

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替换字符串可能包含对在之前的匹配中捕获的子序列的引用。

The replacement string may contain references to subsequences captured during the previous match.

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此引用将作为组件的子元素添加。

The reference is added as a child element of your component.

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记录一个已匹配的子串用作后面的参考引用。

To mark a matched substring for future reference.

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记录一个已匹配的子串用作后面的参考引用。

To mark a matched substring for future reference.

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