supported by the National Natural Science Foundation of China (Nos.60903010,61025007,and 60933001);the National Basic Research Program (973) of China (No.2011CB302206);the Natural Science Foundation of Jiangsu Province,China (No.BK2009268);the Fundamental Research Funds for the Central Universities (No.N110404013);the Key Laboratory of Advanced Information Science and Network Technology of Beijing (No.XDXX1011)
To obtain comparable high query performance with relational databases,diverse database technologies have to be adapted to confront the complexity posed by both Resource Description Framework(RDF) data and SPARQL query...