8 files changed, 49 insertions, 24 deletions
diff --git a/lv2/atom/atom.ttl b/lv2/atom/atom.ttl
index 2f656d5..b0b7e0c 100644
--- a/lv2/atom/atom.ttl
+++ b/lv2/atom/atom.ttl
@@ -229,7 +229,8 @@ atom:childType
 	rdfs:comment "The type of children in a container." .
 
 atom:supports
-	a rdf:Property ;
+	a rdf:Property ,
+		owl:ObjectProperty ;
 	rdfs:label "supports" ;
 	rdfs:comment "A supported atom type." ;
 	rdfs:range rdfs:Class .
diff --git a/lv2/event/event.ttl b/lv2/event/event.ttl
index ec1c4df..de400d4 100644
--- a/lv2/event/event.ttl
+++ b/lv2/event/event.ttl
@@ -41,14 +41,16 @@ ev:generic
 	rdfs:comment "Port works with generic events." .
 
 ev:supportsEvent
-	a rdf:Property ;
+	a rdf:Property ,
+		owl:ObjectProperty ;
 	rdfs:domain ev:EventPort ;
 	rdfs:range rdfs:Class ;
 	rdfs:label "supports event type" ;
 	rdfs:comment "An event type supported by this port." .
 
 ev:inheritsEvent
-	a rdf:Property ;
+	a rdf:Property ,
+		owl:ObjectProperty ;
 	rdfs:domain ev:EventPort ,
 		lv2:OutputPort ;
 	rdfs:range lv2:Port ;
@@ -56,7 +58,8 @@ ev:inheritsEvent
 	rdfs:comment "Output port inherits event types from an input port." .
 
 ev:supportsTimeStamp
-	a rdf:Property ;
+	a rdf:Property ,
+		owl:ObjectProperty ;
 	rdfs:domain ev:EventPort ,
 		lv2:InputPort ;
 	rdfs:range rdfs:Class ;
@@ -64,7 +67,8 @@ ev:supportsTimeStamp
 	rdfs:comment "A time stamp type suported by this input port." .
 
 ev:generatesTimeStamp
-	a rdf:Property ;
+	a rdf:Property ,
+		owl:ObjectProperty ;
 	rdfs:domain ev:EventPort ,
 		lv2:OutputPort ;
 	rdfs:range rdfs:Class ;
@@ -72,7 +76,8 @@ ev:generatesTimeStamp
 	rdfs:comment "A time stamp type generated by this input port." .
 
 ev:inheritsTimeStamp
-	a rdf:Property ;
+	a rdf:Property ,
+		owl:ObjectProperty ;
 	rdfs:domain ev:EventPort ,
 		lv2:OutputPort ;
 	rdfs:range lv2:Port ;
diff --git a/lv2/midi/midi.ttl b/lv2/midi/midi.ttl
index a6af1cf..81f3495 100644
--- a/lv2/midi/midi.ttl
+++ b/lv2/midi/midi.ttl
@@ -269,7 +269,8 @@ midi:channel
 	rdfs:comment "The channel number of a MIDI message." .
 
 midi:chunk
-	a rdf:Property ;
+	a rdf:Property ,
+		owl:ObjectProperty ;
 	rdfs:range midi:Chunk ;
 	rdfs:label "MIDI chunk" ;
 	rdfs:comment "A chunk of a MIDI message." .
diff --git a/lv2/patch/patch.ttl b/lv2/patch/patch.ttl
index a74a67e..e8fe8c6 100644
--- a/lv2/patch/patch.ttl
+++ b/lv2/patch/patch.ttl
@@ -140,7 +140,8 @@ patch:Set
 	rdfs:comment "A compact request to set a property to a value." .
 
 patch:accept
-	a rdf:Property ;
+	a rdf:Property ,
+		owl:ObjectProperty ;
 	rdfs:label "accept" ;
 	rdfs:domain patch:Request ;
 	rdfs:range rdfs:Class ;
@@ -179,14 +180,16 @@ patch:destination
 	rdfs:comment "The destination to move the patch:subject to." .
 
 patch:property
-	a rdf:Property ;
+	a rdf:Property ,
+		owl:ObjectProperty ;
 	rdfs:label "property" ;
 	rdfs:domain patch:Message ;
 	rdfs:range rdf:Property ;
 	rdfs:comment "The property for a patch:Set or patch:Get message." .
 
 patch:readable
-	a rdf:Property ;
+	a rdf:Property ,
+		owl:ObjectProperty ;
 	rdfs:label "readable" ;
 	rdfs:range rdf:Property ;
 	rdfs:comment "A property that can be read with a patch:Get message." .
@@ -227,7 +230,8 @@ patch:subject
 	rdfs:comment "The subject this message applies to." .
 
 patch:value
-	a rdf:Property ;
+	a rdf:Property ,
+		owl:DatatypeProperty ;
 	rdfs:label "value" ;
 	rdfs:domain patch:Set ;
 	rdfs:range rdf:Property ;
@@ -239,7 +243,8 @@ patch:wildcard
 	rdfs:comment "A wildcard that matches any resource." .
 
 patch:writable
-	a rdf:Property ;
+	a rdf:Property ,
+		owl:ObjectProperty ;
 	rdfs:label "writable" ;
 	rdfs:range rdf:Property ;
 	rdfs:comment "A property that can be set with a patch:Set or patch:Patch message." .
diff --git a/lv2/port-props/port-props.ttl b/lv2/port-props/port-props.ttl
index 6dc62d0..1ddeed0 100644
--- a/lv2/port-props/port-props.ttl
+++ b/lv2/port-props/port-props.ttl
@@ -62,14 +62,16 @@ pprops:notOnGUI
 	rdfs:comment "Port that should not be displayed on a GUI." .
 
 pprops:displayPriority
-	a rdf:Property ;
+	a rdf:Property ,
+		owl:DatatypeProperty ;
 	rdfs:domain lv2:Port ;
 	rdfs:range xsd:nonNegativeInteger ;
 	rdfs:label "display priority" ;
 	rdfs:comment "A priority ranking this port in importance to its plugin." .
 
 pprops:rangeSteps
-	a rdf:Property ;
+	a rdf:Property ,
+		owl:DatatypeProperty ;
 	rdfs:domain lv2:Port ;
 	rdfs:range xsd:nonNegativeInteger ;
 	rdfs:label "range steps" ;
diff --git a/lv2/presets/presets.ttl b/lv2/presets/presets.ttl
index 1627ad4..c1caf43 100644
--- a/lv2/presets/presets.ttl
+++ b/lv2/presets/presets.ttl
@@ -35,20 +35,24 @@ pset:Preset
 	] .
 
 pset:bank
-	a rdf:Property ;
+	a rdf:Property ,
+		owl:ObjectProperty ;
 	rdfs:domain pset:Preset ;
 	rdfs:range pset:Bank ;
 	rdfs:label "bank" ;
 	rdfs:comment "The bank this preset belongs to." .
 
 pset:value
-	a rdf:Property ;
+	a rdf:Property ,
+		owl:DatatypeProperty ,
+		owl:FunctionalProperty ;
 	rdfs:domain lv2:PortBase ;
 	rdfs:label "value" ;
 	rdfs:comment "The value of a port in a preset." .
 
 pset:preset
-	a rdf:Property ;
+	a rdf:Property ,
+		owl:ObjectProperty ;
 	rdfs:domain lv2:PluginBase ;
 	rdfs:range pset:Preset ;
 	rdfs:label "preset" ;
diff --git a/lv2/state/state.ttl b/lv2/state/state.ttl
index a344d5f..704b312 100644
--- a/lv2/state/state.ttl
+++ b/lv2/state/state.ttl
@@ -27,7 +27,8 @@ state:loadDefaultState
 	rdfs:comment "A feature indicating that the plugin has default state." .
 
 state:state
-	a rdf:Property ;
+	a rdf:Property ,
+		owl:ObjectProperty ;
 	rdfs:label "state" ;
 	rdfs:range state:State ;
 	rdfs:comment "The state of an LV2 plugin instance." .
diff --git a/lv2/ui/ui.ttl b/lv2/ui/ui.ttl
index 6ff0ad9..61f8bca 100644
--- a/lv2/ui/ui.ttl
+++ b/lv2/ui/ui.ttl
@@ -70,14 +70,16 @@ ui:CocoaUI
 	rdfs:comment "A UI where the widget is a pointer to a NSView." .
 
 ui:ui
-	a rdf:Property ;
+	a rdf:Property ,
+		owl:ObjectProperty ;
 	rdfs:domain lv2:Plugin ;
 	rdfs:range ui:UI ;
 	rdfs:label "user interface" ;
 	rdfs:comment "Relates a plugin to a UI that applies to it." .
 
 ui:binary
-	a rdf:Property ;
+	a rdf:Property ,
+		owl:ObjectProperty ;
 	owl:sameAs lv2:binary ;
 	owl:deprecated "true"^^xsd:boolean ;
 	rdfs:label "binary" ;
@@ -163,7 +165,8 @@ ui:portIndex
 	rdfs:comment "The index of the port a portNotification applies to." .
 
 ui:notifyType
-	a rdf:Property ;
+	a rdf:Property ,
+		owl:ObjectProperty ;
 	rdfs:domain ui:PortNotification ;
 	rdfs:label "notify type" ;
 	rdfs:comment "A particular type that the UI should be notified of." .
@@ -206,19 +209,22 @@ ui:showInterface
 	rdfs:comment "An interface for showing and hiding a window for a UI." .
 
 ui:windowTitle
-	a rdf:Property ;
+	a rdf:Property ,
+		owl:DatatypeProperty ;
 	rdfs:range xsd:string ;
 	rdfs:label "window title" ;
 	rdfs:comment "The title for the window shown by LV2UI_Show_Interface." .
 
 ui:updateRate
-	a rdf:Property ;
+	a rdf:Property ,
+		owl:DatatypeProperty ;
 	rdfs:range xsd:float ;
 	rdfs:label "update rate" ;
 	rdfs:comment "The target rate, in Hz, to send updates to the UI." .
 
 ui:protocol
-	a rdf:Property ;
+	a rdf:Property ,
+		owl:ObjectProperty ;
 	rdfs:domain ui:PortNotification ;
 	rdfs:range ui:PortProtocol ;
 	rdfs:label "protocol" ;