I am not versed in the subject but there was a very nice project based on XML structures over RDB that caught my eye a few years back and now seems to work perfectly.
Have a look at http://exist.sourceforge.net/ to see a nice approach to RDB used to build a more flexible storage system with XQuery as the query language. You should like it, it's open source.
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我不熟悉这个主题，但是有一个非常好的项目，基于 RDB 上的 XML 结构，几年前引起了我的注意，现在似乎运行得很好。
查看 http://exist.sourceforge.net/ 了解用于构建 RDB 的好方法以 XQuery 作为查询语言的更灵活的存储系统。你应该喜欢它，它是开源的。
I am not versed in the subject but there was a very nice project based on XML structures over RDB that caught my eye a few years back and now seems to work perfectly.
Have a look at http://exist.sourceforge.net/ to see a nice approach to RDB used to build a more flexible storage system with XQuery as the query language. You should like it, it's open source.