The trust ontology is a small ontology, written on OWL/RDF, that allows
people to say how much
they trust other people. It extends the large, and very popular FOAF Vocabulary/Ontology.
Trust Scale: Trust in this ontology is rated on a scale from 1 -
10. A rating of 10 signifies absolute trust, and a rating of 1 signifies
no trust. Medium trust would be about a 5. There is no notion of explicit
distrust in this ontology because of the way it complicates inferences
(e.g. if A distrusts B and B distrusts C, should that mean that A trusts C
more than B or less?)
Language Details: The ontology is implemented in OWL. The
trust values are owl:ObjectProperties with a domain and range of
foaf:Person.
Subject Specific Ratings:
There is a special property in the ontology for subject specific trust
ratings. The "trustsRegarding" property takes an instance of TopicalTrust
as its value. TopicalTrust has three properties, all required:
"trustSubject", which should have the URI of the subject of the trsut
rating as a value, "trustedPerson", which should have the Person who is
being rated as the value, and "trustValue", which is a datatype property
that should have the trust rating on a scale from 1 to 10.
<foaf:Person rdf:ID="Jen">
<trust:trustsRegarding>
<trust:TopicalTrust>
<trust:trustSubject rdf:resource="#MovieRecommendations"/>
<trust:trustedPerson rdf:resource="#Dan"/>
<trust:trustValue>8</trust:trustValue>
</trust:TopicalTrust>
</trust:trustsRegarding>
</foaf:Person>