5 papers
PIWD: A Plugin-based Framework for Well-Designed SPARQL
Xiaowang Zhang, Zhenyu Song, Zhiyong Feng +1
In the real world datasets (e.g.,DBpedia query log), queries built on well-designed patterns containing only AND and OPT operators (for short, WDAO-patterns) account for a large pr…
RORS: Enhanced Rule-based OWL Reasoning on Spark
Zhihui Liu, Zhiyong Feng, Xiaowang Zhang +2
The rule-based OWL reasoning is to compute the deductive closure of an ontology by applying RDF/RDFS and OWL entailment rules. The performance of the rule-based OWL reasoning is of…
Efficient Approximation of Well-Designed SPARQL Queries
Zhenyu Song, Zhiyong Feng, Xiaowang Zhang +2
Query response time often influences user experience in the real world. However, it possibly takes more time to answer a query with its all exact solutions, especially when it cont…
On the Statistical Analysis of Practical SPARQL Queries
Xingwang Han, Zhiyong Feng, Xiaowang Zhang +3
In this paper, we analyze some basic features of SPARQL queries coming from our practical world in a statistical way. These features include three statistic features such as the oc…
Context-Free Path Queries on RDF Graphs
Xiaowang Zhang, Zhiyong Feng, Xin Wang +2
Navigational graph queries are an important class of queries that canextract implicit binary relations over the nodes of input graphs. Most of the navigational query languages used…