The data is then indexed using techniques such as XML pattern expression indexing, B-tree structural indexing, structural indexing, content or keyword indexing, and others.

然后，数据被使用诸如 XML 模式表达式索引、B-树结构索引、结构索引、内容或关键字索引之类技术以及其他技术进行索引。

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A transform expression starts with the optional "transform" keyword followed by a COPY, MODIFY, and a RETURN clause.

转换表达式的开头是可选的“transform”关键字，然后是COPY、MODIFY和return子句。

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The return value expression must start on the same line as the return keyword in order to avoid semicolon insertion.

如果返回表达式，则表达式应与return关键字在同一行，以避免误加分号错误。

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