This paper discuses the mapping algorithm between XML document and relation database, the mapping algorithm between XML document and object-oriented database and isomeric database over XML.

论述了XML文档与关系数据库间的映射规则算法、XML文档与面向数据库间的映射规则算法及基于XML异构数据库间的映射规则。

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But finding necessitous multimedia resources in the immense database that is distributed, isomeric, and dynamic update becomes increasingly difficulty by the way of browsing webpage manually.

但是想通过浏览网页的方式手动的从这样一个分散、异构并且动态更新的浩瀚资源库中找到自己需要的多媒体资源也越来越困难。

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