ontop

Ontop is a platform to query relational databases as Virtual RDF Knowledge Graphs using SPARQL

OpenStreetMap for the Semantic Web

Clone any visible window's appearance to show always on top. Picture-in-Picture.

Web app that provides an analysis of theme park ride accidents using Semantic Web technologies (RDF & SPARQL). Made with Python.

onprom is an OBDA-based event log extraction tool suite

Allows to query MediaWiki SQL database using SPARQL

Query a Virtual Knowledge Graph over Iceberg in Trino, Nessie as Catalog, and use minio to replace AWS S3

All you need to convert relational databases (RDB) to RDF in a declarative & fully automated way.

The Virtual Knowledge Graph of the Open Data Hub

ontopEO is an extension of Ontop to query openEO data as a Virtual Knowledge Graph

knowledge graph application designed to integrate and reason over food-related data using a domain-specific ontology and advanced semantic techniques

Contains the identifiers.org ontology files and the ontop setup for triple generation.

Processamento de consultas SPARQL em bases de dados abertas do SUS com Ontop

Keeps the Windows Hello / passkey prompt on top and focused on Windows 11 (Korean/English)

Ramona Anti-Trafficking and Recruitment-fraud Ontology (RATR-O) v1.1 and Virtual Knowledge Graph observatory. Prepared for the Dialogue Residency at the Institute of Logic and Computation, TU Wien, May to July 2026.

Compares VKG approach against PostgreSQL + REST API for cloud-native geospatial data integration. Federates Sentinel-2 COGs (raster) and Overture Maps GeoParquet (vector) via DuckDB FDW, PostGIS, and PL/Python. Evaluates two raster integration strategies, and SPARQL (Ontop VKG) vs REST API (pg_featureserv) trade-offs. Fully Dockerised.

Querying SQL databases using SPARQL through HTTP

Templated Mapping Language (TML) Parser that enhances reproducibility of KGC engines using the mapping(s) in mapping languages.

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