| 一种基于XQuery的查询分解算法 |
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| 引用本文： | 龙浩,霍娜.一种基于XQuery的查询分解算法[J].徐州建筑职业技术学院学报,2012,12(4):17-21. |
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| 作者姓名： | 龙浩 霍娜 |
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| 作者单位： | 徐州工业职业技术学院信息管理技术学院,江苏徐州,221140 |
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| 摘 要： | 针对查询分解算法查询的局限性和较低的查全率，提出了一种基于本体XQuery语言FWR表达式的查询分解算法．该算法利用XQuery全局查询语句，以FWR表达式的3项操作（构造查询范围、子查询条件和子查询输出属性集）将基于全局本体的查询分解到针对局部本体的子查询，能够降低查询分解的复杂性、保证查询的语义完整性，并能提高查全率．通过实例进行具体分析，验证了算法的有效性．
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| 关 键 词： | 本体 XQuery FWR 查询分解 语义完整性 查全率 |
A Query Decomposition Algorithm Based on XQuery |
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| LONG Hao,HUO Na.A Query Decomposition Algorithm Based on XQuery[J].Journal of XUZHOU Institute of Architectural Technology,2012,12(4):17-21. |
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| Authors: | LONG Hao HUO Na |
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| Affiliation: | ( School of Information Management Technology, Xuzhou College of Industrial Technology, Xuzhou, Jiangsu 221140, China ) |
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| Abstract: | According to the limitation and low recall ratio of query decomposition algorithm, this paper puts forward a query decomposition based on FWR expression of ontology XQuery lan-guage. Using XQuery global query language, this algorithm decomposes query based on global ontology into sub-queries for local ontology with 3 operations of FWR expression （construct que- ry range, query condition and output attribute set of sub--query）. It can decrease the complexity of query decomposition, ensure semantic integrity of query and increase recall ratio. Through concrete analysis with examples, we verify the validity of XQuery algorithm. |
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| Keywords: | ontology XQuery FWR query decomposition semantic integrity recall ratio |
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