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.
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.
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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