Holding data attributes in XML could allow a very flexible schema in which attributes can be removed or added without changing the logical database schema.
将数据属性保存在XML中可以允许采用非常灵活的模式，能在不用更改逻辑数据库模式的情况下添加或删除属性。
Holding data attributes in XML could allow a very flexible schema in which attributes can be removed or added without changing the logical database schema.
将数据属性保存在XML中可以允许采用非常灵活的模式，能在不用更改逻辑数据库模式的情况下添加或删除属性。
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