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.
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.
出处
《江苏建筑职业技术学院学报》
2012年第4期17-21,共5页
Journal Of Jiangsu Vocational Institute of Architectural Technology