how to stay ontop of your data databases ontologies and more

Ontop is an Ontology Based Data Access system allowing users to access a relational database through a conceptual layer provided by an ontology. In this demo, we use the recently developed NPD benchmark +4 billion triples to demonstrate the features of Ontop. First we use Ontop as a SPARQL end-point to load the ontology and mappings, and answer SPARQL queries. Then, we will show how to use Ontop to check inconsistencies and exploit SWRL ontologies

The Ontop framework for ontology based data access

Ontology Based Data Access Ontology Based Data Access (OBDA) Formally, an OBDA system is a triple O = T , S, M , where: -T is the intensional level of an ontology. We consider ontologies formalized in description logics (DLs), hence T is a DL TBox. -S is a relational database representing the sources. -M is a set of mapping assertions, each one of the form • Φ(x) is a query over S, returning tuples of values for x • Ψ (x) is a query over T whose free variables are from x. The main functionality of OBDA systems is query answering. A schematic description of the query transformation process (usually SPARQL to SQL) performed by a typical OBDA system is provided i

The virtual knowledge graph system ontop

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