Ontology files are optionally accompanied by description files, those have the same basename, but the ".description" extension.
@prefix dsc: <http://www.tracker-project.org/temp/dsc#> . <virtual-ontology-uri:30-nie.ontology> a dsc:Ontology ; dsc:title "Example ontology" ; dsc:description "A little bit of this and that." ; dsc:upstream "http://www.example.org/ontologies"; dsc:author "John doe, <john@example.org>"; dsc:editor "Jane doe, <jane@example.org>"; dsc:gitlog "http://git.example.org/cgit/tracker/log/example.ontology"; dsc:contributor "someone else, <some1@example.org>"; dsc:localPrefix "ex" ; dsc:baseUrl "http://www.example.org/ontologies/ex#"; dsc:relativePath "./10-ex.ontology" ; dsc:copyright "All rights given away".