From https://labs.etsi.org/rep/saref/saref-portal/-/issues/67 _In SAREF4CITY, the accessibility of the event (s4city:hasAccesibility - contains a typo) is only provided as skos:Concept. A concept scheme should be provided or linked to._ Add skos:ConceptScheme Changes have to be performed in the OWL code, TS, diagrams, documentation and tests.