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SLE 2019
Sun 20 - Fri 25 October 2019 Athens, Greece
co-located with SPLASH 2019
Tue 22 Oct 2019 14:30 - 15:00 at Templars - Session 7: DSLs and Composition Chair(s): Eugene Syriani

Graph data models are interesting in various domains, in part because of the intuitiveness and flexibility they offer compared to relational models. Specialized query languages, such as Cypher for property graphs or SPARQL for RDF, facilitate their use. In this paper, we present an empirical study on the usage of graph-based query languages in open-source Java projects on GitHub. We investigate the usage of SPARQL, Cypher, Gremlin and GraphQL in terms of popularity and their development over time. We select repositories based on dependencies related to these technologies and employ various popularity and source-code based filters and ranking features for a targeted selection of projects. For the concrete languages SPARQL and Cypher, we analyze the activity of repositories over time. For SPARQL, we investigate common application domains, query use and existence of ontological data modeling in applications that query for concrete instance data. Our results show, that the usage of graph query languages in open-source projects increased over the last years, with SPARQL and Cypher being by far the most popular. SPARQL projects are more active in terms of query related artifact changes and unique developers involved, but Cypher is catching up. Relatively few applications use SPARQL to query for concrete instance data: A majority of those applications employ multiple different ontologies, including project and domain specific ones. Common application domains are management systems and data visualization tools.

Tue 22 Oct
Times are displayed in time zone: Beirut change

14:00 - 15:30: Session 7: DSLs and CompositionSLE 2019 at Templars
Chair(s): Eugene SyrianiUniversité de Montréal
14:00 - 14:30
Efficient Late Binding of Dynamic Function Compositions
SLE 2019
Lars SchützeTechnische Universität Dresden, Jeronimo CastrillonTU Dresden, Germany
14:30 - 15:00
Empirical Study on the Usage of Graph Query Languages in Open Source Java Projects
SLE 2019
Philipp SeiferUniversity of Koblenz-Landau, Germany, Johannes HärtelUniversity of Koblenz-Landau, Germany, Martin LeinbergerUniversity of Koblenz-Landau, Germany, Ralf LaemmelFacebook London, Steffen StaabUniversity of Koblenz-Landau and University of Southampton, Germany
15:00 - 15:30
From DSL specification to interactive computer programming environment
SLE 2019
Pierre JeanjeanInria, Univ Rennes, CNRS, IRISA, Benoit CombemaleUniversity of Toulouse, Olivier BaraisUniv. Rennes, Inria, CNRS, IRISA