这种技术通常需要自己编写自定义的应用程序逻辑从XML文档中提取数据，然后放到关系数据库的表列中。

Often the technology in question is custom application logic that you wrote yourself to extract data from an XML document and put it into a column on a table in a relational database.

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这个查询返回定时的表列数据，理解起来并不难。

This returns regular, tabular data and is not too complicated to understand.

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注意它们包含了与数据库表列，以及设置的主关键字、关系相对应的区域(图19)。

Notice that they contain fields corresponding to the database table columns and that the primary keys and relationships have been set (Figure 19).

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