摘要
随着RDF的出现,其相应的查询语言也应运而生。然而,这些语言都没有考虑RDF代数关系(RDF algebra,简称RAL),因此,这样的RDF查询语言通常没有使用APIs来描述它们的语义和优化问题,这对于RDF查询会导致一种低性能行为。为此,为RDF查询语言和执行RDF查询优化提供一种RAL。首先定义RAL的数据模型、然后呈现处理数据的运算和等价规则、最后描述应用RAL运算和等价规则来查询RDF的优化。
Along with the RDF emergence,it corresponds of the query language also emerges with the tide of the times, However,all these languages don＇t consider RDF algebra（RDF algebra,for short RAL）, therefore, such the RDF query languages usually don＇t use APIs to describe their semantics and optimization issues, which results in a poor performance behavior for querying RDF. This paper proposes an RAL for RDF query languages and for performing RDF query optimization. It defines RAL data model first in the text, then presents operators and equivalence laws of processing data, and describes the optimization of applying RAL operators and equivalence laws to query RDF finally.
出处
《计算技术与自动化》
2007年第2期73-76,共4页
Computing Technology and Automation
