Stefan gave a talk for the Wikidata Ontology Cleaning Task Force about zelph.org and its potential applications for analyzing and cleaning the Wikidata ontology.

See https://nexuslua.org

A poster about zelph.org was presented at Wikimania 2025 in Nairobi (August 6-9).

Stefan presented zelph, an innovative open-source semantic network system designed to improve Wikidata’s data quality, at the Wikimedia Hackathon 2025. The presentation demonstrated how zelph processes the complete Wikidata dataset (1.7 TB), detects logical contradictions, and makes automatic inferences based on existing relationships.

Particularly highlighted was zelph’s ability to define inference rules within the network itself and perform meta-reasoning about relationships. A live demonstration illustrated the practical application using real examples from Wikidata.

Stefan presented the innovative Raku-based installer of the Linux distribution Ditana GNU/Linux at the Fellowship meeting of the Free Software Foundation Europe (Switzerland/Zurich group). The presentation showcased the technical features and philosophy behind Ditana.

For more information about Ditana, visit https://ditana.org

See https://github.com/acrion/cbeam and https://cbeam.org

In an extensive 80-minute interview with the GNU/Linux.ch podcast, the Linux distribution Ditana was presented in detail. The conversation covered Ditana’s technical features, particularly its innovative Raku-based installer, as well as the philosophy behind the distribution.

Listen to the full interview here: https://gnulinux.ch/ciw119-podcast

For more information about Ditana, visit https://ditana.org