/usr/share/ontology/kde/kao.ontology is in libkactivities-bin 4:4.13.0-0ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 | [Ontology]
Version=1.0
Name=KDE Activities Ontology
Comment=KDE Activities Ontology contains classes that are related to the Activity Manager system
Namespace=http://nepomuk.kde.org/ontologies/2012/02/29/kao#
Path=/usr/share/ontology/kde/kao.trig
MimeType=application/x-trig
Type=Data
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