KeywDB: A System for Keyword-Driven Ontology-to-RDB Mapping Construction

In ontology-based data access (OBDA) the users access relational databases (RDBs) via ontologies that mediate between the users and the data. Ontologies are connected to data via declarative ontologyto-RDB mappings that relate each ontological term to an SQL query. In this demo we present our system KeywDB that facilitates construction of ontology-to-RDB mappings in an interactive fashion. In KeywDB users provide examples of entities for classes that require mappings and the system returnes a ranked list of such mappings. In doing so KeywDB relies on techniques for keyword query answering over RDBs. During the demo the attendees will try KeywDB with Northwind and NPD FP databases and collections of mappings that we prepare.