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+@prefix doap:  <http://usefulinc.com/ns/doap#> .
+@prefix foaf:  <http://xmlns.com/foaf/0.1/> .
+@prefix lv2:   <http://lv2plug.in/ns/lv2core#> .
+@prefix morph: <http://lv2plug.in/ns/ext/morph#> .
+@prefix opts: <http://lv2plug.in/ns/ext/options#> .
+@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 xsd:   <http://www.w3.org/2001/XMLSchema#> .
+
+<http://lv2plug.in/ns/ext/morph>
+	a owl:Ontology ;
+	rdfs:seeAlso <morph.h> ,
+		<lv2-morph.doap.ttl> ;
+	lv2:documentation """
+<p>This extension defines two port types: morph:MorphPort, which has a
+host-configurable type, and morph:AutoMorphPort, which may automatically change
+type when a MorphPort's type is changed.  These ports always have a default
+type and work normally work in hosts that are unaware of this extension.  Thus,
+this extension provides a backwards compatibility mechanism which allows
+plugins to use new port types but gracefully fall back to a default type in
+hosts that do not support them.</p>
+
+<p>This extension only defines port types and properties for describing morph
+ports.  The actual run-time switching is done via the opts:interface API.</p>
+""" .
+
+morph:MorphPort
+	a rdfs:Class ,
+		owl:Class ;
+	rdfs:subClassOf lv2:Port ;
+	rdfs:label "Morph Port" ;
+	lv2:documentation """
+<p>Ports of this type MUST have another type which defines the default buffer
+format (e.g. lv2:ControlPort) but can be dynamically changed to a different
+type in hosts that support opts:interface.</p>
+
+<p>The host may change the type of a MorphPort by setting its morph:currentType
+with LV2_Options_Interface::set().  If the plugin has any morph:AutoMorphPort
+ports, the host MUST check their types after changing any port type since they
+may have changed.</p> """ .
+
+morph:AutoMorphPort
+	a rdfs:Class ,
+		owl:Class ;
+	rdfs:subClassOf lv2:Port ;
+	rdfs:label "Auto Morph Port" ;
+	lv2:documentation """
+<p>Ports of this type MUST have another type which defines the default buffer
+format (e.g. lv2:ControlPort) but may dynamically change types based on the
+configured types of any morph:MorphPort ports on the same plugin instance.</p>
+
+<p>The type of a port may only change in response to a host call to
+LV2_Options_Interface::set().  Whenever any port type on the instance changes,
+the host MUST check the type of all morph:AutoMorphPort ports with
+LV2_Options_Interface::get() before calling run() again, since they may have
+changed.  If the type of any port is zero, it means the current configuration
+is invalid and the plugin may not be run (unless that port is
+lv2:connectionOptional and connected to NULL).</p>
+
+<p>This is mainly useful for outputs whose type depends on the type of
+corresponding inputs.</p>
+""" .
+
+morph:supportsType
+	a rdf:Property ,
+		owl:ObjectProperty ;
+	rdfs:domain morph:MorphPort ;
+	rdfs:label "supports type" ;
+	lv2:documentation """
+<p>Indicates that a port supports being switched to a certain type.  A
+MorphPort MUST list each type it supports being switched to in the plugin data
+using this property.</p>
+""" .
+
+morph:currentType
+	a rdf:Property ,
+		opts:Option ,
+		owl:ObjectProperty ;
+	rdfs:domain morph:MorphPort ;
+	rdfs:label "current type" ;
+	lv2:documentation """
+<p>The currently active type of the port.  This is for dynamic use as an option
+and SHOULD NOT be listed in the static plugin data.</p>
+""" .