@prefix example: <http://example.org/ns#> .
@prefix nrl: <http://www.semanticdesktop.org/ontologies/2007/08/15/nrl#> .
@prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> .
@prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#> .
@prefix tracker: <http://www.tracker-project.org/ontologies/tracker#> .
@prefix xsd: <http://www.w3.org/2001/XMLSchema#> .

example: a tracker:Namespace ;
	tracker:prefix "example" .

example:Message a rdfs:Class ;
	rdfs:subClassOf rdfs:Resource .

example:Group a rdfs:Class ;
	rdfs:subClassOf rdfs:Resource .

example:date a rdf:Property ;
	nrl:maxCardinality 1 ;
	rdfs:domain example:Message ;
	rdfs:range xsd:dateTime .

example:group a rdf:Property ;
	nrl:maxCardinality 1 ;
	rdfs:domain example:Message ;
	rdfs:range example:Group .

example:lastDate a rdf:Property ;
	nrl:maxCardinality 1 ;
	rdfs:domain example:Group ;
	rdfs:range xsd:dateTime .

