DB2 enables users to store XML documents intact with full DBMS knowledge of the document's internal structure.

DB 2使用户能够完整地存储XML文档，同时DBMS完全掌握文档的内部结构。

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The former cann't get a satisfied precision and recall for users, while the later requires users have a high awareness of knowledge structure and shows a bad effect to knowledge search and resue.

前者无法满足用户对于查准率和查全率的要求，而后者需要用户对知识结构具有较高的认知，这影响了知识检索和重用的效果。

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