Demonstrating Interactive SPARQL Formulation through Positive and Negative Examples and Feedback

The formulation of structured queries in Knowledge Graphs is a challenging task since it presupposes familiarity with the syntax of the query language and the contents of the knowledge graph. To alleviate this problem, for enabling plain users to formulate SPARQL queries, and advanced users to formulate queries with less effort, in this paper we introduce a novel method for “SPARQL by Example". According to this method the user points to positive/negative entities, the system computes one query that describes these entities, and then the user refines the query interactively by providing positive/negative feedback on entities and suggested constraints. We shall demonstrate SPARQL-QBE , a tool that implements this approach, and we will briefly refer to the results of a task-based evaluation with users that provided positive evidence about the usability of the approach.