3 papers
cs.DB2026
Rewriting Ontology-Mediated Property Graph Queries into GQL
Bianca Löhnert, Nikolaus Augsten, Cem Okulmus +1
Ontology-based data access is intended for graph data, but practical support remains limited to SQL-like languages lacking the navigational and path-matching features fundamental t…
cs.AI2026
Shapes from Examples: Foundations of Shape Learning in Recursive SHACL
Bente Gortworst, Cem Okulmus, Magdalena Ortiz +1
SHACL shapes enable data graph validation, making automatic shape learning essential for knowledge graph applications. We investigate the well-known fitting approach to this task:…
cs.DB2024
Towards Practicable Algorithms for Rewriting Graph Queries beyond DL-Lite
Bianca Löhnert, Nikolaus Augsten, Cem Okulmus +1
Despite the many advantages that ontology-based data access (OBDA) has brought to a range of application domains, state-of-the-art OBDA systems still do not support popular graph d…