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+@prefix lv2:  <http://lv2plug.in/ns/lv2core#> .
+@prefix owl:  <http://www.w3.org/2002/07/owl#> .
+@prefix rdf:  <http://www.w3.org/1999/02/22-rdf-syntax-ns#> .
+@prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#> .
+@prefix time: <http://lv2plug.in/ns/ext/time#> .
+@prefix xsd:  <http://www.w3.org/2001/XMLSchema#> .
+
+<http://lv2plug.in/ns/ext/time>
+	a owl:Ontology ;
+	rdfs:seeAlso <time.h> ,
+		<lv2-time.doap.ttl> ;
+	lv2:documentation """
+<p>This is a vocabulary for precisely describing a position in time and the
+passage of time itself, in both real and musical terms.</p>
+
+<p>In addition to real time (e.g. seconds), two units of time are used:
+<q>frames</q> and <q>beats</q>.  A frame is a numbered quantum of time.  Frame
+time is related to real-time by the <q>frame rate</q> or <q>sample rate</q>,
+time:framesPerSecond.  A beat is a single pulse of musical time.  Beat time is
+related to real-time by the <q>tempo</q>, time:beatsPerMinute.</p>
+
+<p>Musical time additionally has a <q>meter</q> which describes passage of time
+in terms of musical <q>bars</q>.  A bar is a higher level grouping of beats.
+The meter describes how many beats are in one bar.</p>
+""" .
+
+time:Time
+	a rdfs:Class ;
+	rdfs:subClassOf time:Position ;
+	rdfs:label "Time" ;
+	rdfs:comment "A point in time in some unit/dimension." .
+
+time:Position
+	a rdfs:Class ;
+	rdfs:label "Position" ;
+	lv2:documentation """
+<p>A point in time and/or the speed at which time is passing.  A position is
+both a point and a speed, which precisely defines a time within a timeline.</p>
+""" .
+
+time:Rate
+	a rdfs:Class ;
+	rdfs:subClassOf time:Position ;
+	rdfs:label "Rate" ;
+	lv2:documentation """
+<p>The rate of passage of time in terms of one unit with respect to
+another.</p> """ .
+
+time:position
+	a rdf:Property ,
+		owl:ObjectProperty ,
+		owl:FunctionalProperty ;
+	rdfs:range time:Position ;
+	rdfs:label "position" .
+
+time:barBeat
+	a rdf:Property ,
+		owl:DatatypeProperty ,
+		owl:FunctionalProperty ;
+	rdfs:domain time:Time ;
+	rdfs:range xsd:float ;
+	rdfs:label "beat within bar" ;
+	rdfs:comment "The beat number within the bar, from 0 to beatsPerBar." .
+
+time:bar
+	a rdf:Property ,
+		owl:DatatypeProperty ,
+		owl:FunctionalProperty ;
+	rdfs:domain time:Time ;
+	rdfs:range xsd:long ;
+	rdfs:label "bar" .
+
+time:beat
+	a rdf:Property ,
+		owl:DatatypeProperty ,
+		owl:FunctionalProperty ;
+	rdfs:domain time:Time ;
+	rdfs:range xsd:double ;
+	rdfs:label "beat" ;
+	rdfs:comment """
+The global running beat number.  This is not the beat within a bar like barBeat,
+but relative to the same origin as time:bar and monotonically increases unless
+the transport is repositioned.
+""" .
+
+time:beatUnit
+	a rdf:Property ,
+		owl:DatatypeProperty ,
+		owl:FunctionalProperty ;
+	rdfs:domain time:Rate ;
+	rdfs:range xsd:nonNegativeInteger ;
+	lv2:documentation """
+<p>Beat unit, the note value that counts as one beat.  This is the bottom number
+in a time signature: 2 for half note, 4 for quarter note, and so on.</p>
+""" .
+
+time:beatsPerBar
+	a rdf:Property ,
+		owl:DatatypeProperty ,
+		owl:FunctionalProperty ;
+	rdfs:domain time:Rate ;
+	rdfs:range xsd:float ;
+	rdfs:label "beats per bar" .
+
+time:beatsPerMinute
+	a rdf:Property ,
+		owl:DatatypeProperty ,
+		owl:FunctionalProperty ;
+	rdfs:domain time:Rate ;
+	rdfs:range xsd:float ;
+	rdfs:label "beats per minute" ;
+	rdfs:comment "Tempo in beats per minute." .
+
+time:frame
+	a rdf:Property ,
+		owl:DatatypeProperty ,
+		owl:FunctionalProperty ;
+	rdfs:domain time:Time ;
+	rdfs:range xsd:long ;
+	rdfs:label "frame" .
+
+time:framesPerSecond
+	a rdf:Property ,
+		owl:DatatypeProperty ,
+		owl:FunctionalProperty ;
+	rdfs:domain time:Rate ;
+	rdfs:range xsd:float ;
+	rdfs:label "frames per second" ;
+	rdfs:comment "Frame rate in frames per second." .
+
+time:speed
+	a rdf:Property ,
+		owl:DatatypeProperty ,
+		owl:FunctionalProperty ;
+	rdfs:domain time:Rate ;
+	rdfs:range xsd:float ;
+	rdfs:label "speed" ;
+	lv2:documentation """
+<p>The rate of the progress of time as a fraction of normal speed.  For
+example, a rate of 0.0 is stopped, 1.0 is rolling at normal speed, 0.5 is
+rolling at half speed, -1.0 is reverse, and so on.
+</p>
+""" .