In addition to general query such as single query, complex query, etc, our system also provide a query based structure and content.

并行数字图书馆系统除了提供目前数字图书馆提供的简单查询、复杂查询等一般查询功能之外，还提供了基于结构和内容的查询。

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Concerning the keyword search in XML document, the meaningless query results are studied from two aspects: equivalence of content in element labels and similarity in element structure.

针对XML文档关键字搜索问题，从元素标签内容等价和元素结构相似性等价两个方面考虑无效的查询结果。

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