Generating On the Fly Queries for the Semantic Web: The ICS-FORTH Graphical RQL Interface (GRQL)

Abstract. Building user-friendly GUIs for browsing and filtering RDF/S description bases while exploiting in a transparent way the expressiveness of declarative query/view languages is vital for various Semantic Web applications (e.g., e-learning, e-science). In this paper we present a novel interface, called GRQL, which relies on the full power of the RDF/S data model for constructing on the fly queries expressed in RQL. More precisely, a user can navigate graphically through the individual RDF/S class and property definitions and generate transparently the RQL path expressions required to access the resources of interest. These expressions capture accurately the meaning of its navigation steps through the class (or property) subsumption and/or associations. Additionally, users can enrich the generated queries with filtering conditions on the attributes of the currently visited class while they can easily specify the resource’s class(es) appearing in the query result. To the best of...

• Type: Conference
• Year: 2004
• Where: SEMWEB
• Authors: Nikolaos Athanasis, Vassilis Christophides, Dimitris Kotzinos
• Keywords: Building User-friendly Guis, RQL Path Expressions, SEMWEB 2004, Unique Rql Query