Key (lock)

Upper ontology

Epistemology

World Wide Web

Process ontology

Philosophy

Semantic Web

Ontology-based data integration

Information retrieval

Data science

Ontology

Computer science

Relational database

Computer security

Data access

Database

We present the framework of ontology-based data access, a semantic paradigm for providing a convenient and user-friendly access to data repositories, which has been actively developed and studied in the past decade. Focusing on relational data sources, we discuss the main ingredients of ontology-based data access, key theoretical results, techniques, applications and future challenges.

Ontology-Based Data Access: A Survey