3 files changed, 39 insertions, 5 deletions
diff --git a/lv2/ui.lv2/manifest.ttl b/lv2/ui.lv2/manifest.ttl
index 4f5ed48..a77d6d0 100644
--- a/lv2/ui.lv2/manifest.ttl
+++ b/lv2/ui.lv2/manifest.ttl
@@ -3,6 +3,6 @@
 
 <http://lv2plug.in/ns/extensions/ui>
 	a lv2:Specification ;
-	lv2:minorVersion 2 ;
-	lv2:microVersion 24 ;
+	lv2:minorVersion 3 ;
+	lv2:microVersion 0 ;
 	rdfs:seeAlso <ui.ttl> .
diff --git a/lv2/ui.lv2/ui.meta.ttl b/lv2/ui.lv2/ui.meta.ttl
index ede80ae..393d8d6 100644
--- a/lv2/ui.lv2/ui.meta.ttl
+++ b/lv2/ui.lv2/ui.meta.ttl
@@ -99,6 +99,16 @@ not be used in the same process.
 
 """^^lv2:Markdown .
 
+ui:Gtk4UI
+	lv2:documentation """
+
+The host must guarantee that the Gtk+ 4 library has been initialised and the
+Glib main loop is running before the UI is instantiated.  Note that this UI
+type is not suitable for binary distribution since multiple versions of Gtk can
+not be used in the same process.
+
+"""^^lv2:Markdown .
+
 ui:Qt4UI
 	lv2:documentation """
 
@@ -119,6 +129,16 @@ used in the same process.
 
 """^^lv2:Markdown .
 
+ui:Qt6UI
+	lv2:documentation """
+
+The host must guarantee that the Qt6 library has been initialised and the Qt6
+main loop is running before the UI is instantiated.  Note that this UI type is
+not suitable for binary distribution since multiple versions of Qt can not be
+used in the same process.
+
+"""^^lv2:Markdown .
+
 ui:X11UI
 	lv2:documentation """
 
diff --git a/lv2/ui.lv2/ui.ttl b/lv2/ui.lv2/ui.ttl
index a59b069..c42992e 100644
--- a/lv2/ui.lv2/ui.ttl
+++ b/lv2/ui.lv2/ui.ttl
@@ -34,6 +34,13 @@ ui:Gtk3UI
 	rdfs:label "GTK3 UI" ;
 	rdfs:comment "A UI where the widget is a pointer to a Gtk+ 3.0 GtkWidget." .
 
+ui:Gtk4UI
+	a rdfs:Class ,
+		owl:Class ;
+	rdfs:subClassOf ui:UI ;
+	rdfs:label "GTK4 UI" ;
+	rdfs:comment "A UI where the widget is a pointer to a Gtk+ 4.0 GtkWidget." .
+
 ui:Qt4UI
 	a rdfs:Class ,
 		owl:Class ;
@@ -48,6 +55,13 @@ ui:Qt5UI
 	rdfs:label "Qt5 UI" ;
 	rdfs:comment "A UI where the widget is a pointer to a Qt5 QWidget." .
 
+ui:Qt6UI
+	a rdfs:Class ,
+		owl:Class ;
+	rdfs:subClassOf ui:UI ;
+	rdfs:label "Qt6 UI" ;
+	rdfs:comment "A UI where the widget is a pointer to a Qt6 QWidget." .
+
 ui:X11UI
 	a rdfs:Class ,
 		owl:Class ;
@@ -81,13 +95,13 @@ ui:binary
 	a rdf:Property ,
 		owl:ObjectProperty ;
 	owl:sameAs lv2:binary ;
-	owl:deprecated "true"^^xsd:boolean ;
+	owl:deprecated true ;
 	rdfs:label "binary" ;
 	rdfs:comment "The shared library that a UI resides in." .
 
 ui:makeSONameResident
 	a lv2:Feature ;
-	owl:deprecated "true"^^xsd:boolean ;
+	owl:deprecated true ;
 	rdfs:label "make SO name resident" ;
 	rdfs:comment "UI binary must not be unloaded." .
 
@@ -174,7 +188,7 @@ ui:notifyType
 ui:resize
 	a lv2:Feature ,
 		lv2:ExtensionData ;
-	owl:deprecated "true"^^xsd:boolean ;
+	owl:deprecated true ;
 	rdfs:label "resize" ;
 	rdfs:comment """A feature that provides control of, and notifications about, a UI's size.""" .