Mechanism needed to add ontologies.
It would be useful to be able to annotate an RDF subject in Tracker with predicates and objects from arbitrary ontologies.
For example, a Turtle file might be written using the UUID subject for a file that has been indexed by Tracker. Classes and properties from the Information Artifact Ontology could be used. However, attempting to import such a Turtle file gives the following error:
$ tracker index --import file.ttl Importing Turtle file:'file.ttl' Unable to import Turtle file, GDBus.Error:org.freedesktop.Tracker1.SparqlError.UnknownClass: Class 'http://purl.obolibrary.org/obo/IAO_0000310' not found in the ontology