f-SPARQL is a fuzzy extension of SPARQL, which allows, in FILTER constraint, the occurrence of fuzzy terms, e.g. young and tall, and fuzzy operators, e.g. close to and at most. The fuzzy terms and fuzzy operators along with the query variables form the so-called fuzzy constraints.
Published in Chapter:
RDF Storage and Querying: A Literature Review
Jingwei Cheng (Northeastern University, China), Z. M. Ma (Northeastern University, China), and Qiang Tong (Northeastern University, China)
Copyright: © 2016
|Pages: 19
DOI: 10.4018/978-1-4666-8767-7.ch017
Abstract
RDF plays an important role in representing Web resources in a natural and flexible way. As the amount of RDF datasets increasingly growing, storing and querying theses data have attracted the attention of more and more researchers. In this chapter, we first make a review of approaches for query processing of RDF datasets. We categorize existing methods as two classes, those making use of RDBMS to implement the storage and retrieval, and those devising their own native storage schemas. They are called Relational RDF Stores and Native Stores respectively. Secondly, we survey some important extensions of SPARQL, standard query language for RDF, which extend the expressing power of SPARQL to allow more sophisticated language constructs that meet the needs from various application scenarios.