Abstract: In order to deal with the fuzzy queries of RDF with relative quantifiers， an approach of querying RDF with relative quantifiers was proposed， which can also support grouping mechanism. A linguistic hierarchy table reflecting various accuracies of fuzzy constraints was first constructed. An extended SPARQL syntax was hereby proposed by introducing fuzzy conditions in FILTER clause and calling GROUP BY and HAVING clauses to accomplish grouping operations over specific attributes. Two typical cases of fuzzy RDF querying with relative quantifiers were analyzed. On the basis， how to translate fuzzy SPARQL queries into classic SPARQL queries was investigated so that the existing SPARQL implementations can handle the fuzzy RDF querying with relative quantifiers. Finally， an experimental system is developed and the experimental results show the feasibility of the proposed approach.

Key words: RDF(resource description framework), relative quantifier, linguistic hierarchies, SPARQL, fuzzy query