For example, using the sample data in Figure 1, the following index idx1 would be useful for look-ups and joins based on author IDs across all documents in the XML column bookinfo of the table books.

例如，使用图1中的示例数据，可以根据author id使用下面的索引idx 1对表books的xml列bookinfo中的所有文档进行查找和连接。

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