相反,您将xml树用作内存中的小型单用户层次结构数据库。
Instead, you are using the XML tree as a small, in memory, single user hierarchical database.
就其性质而言,关系数据库比层次数据存储结构(如xml)更灵活。
Relational databases are, by their nature, more flexible than hierarchical data storage structures such as XML.
我们可以通过标准的关系方法或使用新的数据类型,在数据库中表示该层次结构关系。
We can represent this hierarchical relationship in the database through standard relational methods or using new data types.
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