4 files changed, 27 insertions, 13 deletions
diff --git a/lv2/core/lv2core.ttl b/lv2/core/lv2core.ttl
index dd3e6bd..20bcacc 100644
--- a/lv2/core/lv2core.ttl
+++ b/lv2/core/lv2core.ttl
@@ -146,6 +146,11 @@ lv2:Plugin
 		owl:onProperty doap:name ;
 		owl:someValuesFrom rdf:PlainLiteral ;
 		rdfs:comment "A plugin MUST have at least one untranslated doap:name." ;
+	] , [
+		a owl:Restriction ;
+		owl:onProperty lv2:port ;
+		owl:allValuesFrom lv2:Port ;
+		rdfs:comment "All ports on a plugin MUST be fully specified lv2:Port instances." ;
 	] ;
 	lv2:documentation """
 <p>The class which represents an LV2 plugin.</p>
@@ -162,22 +167,34 @@ e.g. <q>Tape Delay Unit</q>. Use doap:shortdesc or doap:description for more
 detailed descriptions.</p>
 """ .
 
+lv2:PortBase
+	a rdfs:Class ,
+		owl:Class ;
+	rdfs:label "Port Base" ;
+	rdfs:subClassOf [
+		a owl:Restriction ;
+		owl:onProperty lv2:symbol ;
+		owl:cardinality 1 ;
+		rdfs:comment "A port MUST have exactly one lv2:symbol." ;
+	] ;
+	lv2:documentation """
+<p>Similar to lv2:PluginBase, an abstract port-like resource that MAY not
+actually be a fully specified LV2 port .  For example, this is used for preset
+"ports" which do not specify an index.</p>
+""" .
+
 lv2:Port
 	a rdfs:Class ,
 		owl:Class ;
 	rdfs:label "Port" ;
-	rdfs:subClassOf [
+	rdfs:subClassOf lv2:PortBase ,
+	[
 		a owl:Restriction ;
 		owl:onProperty lv2:index ;
 		owl:cardinality 1 ;
 		rdfs:comment "A port MUST have exactly one lv2:index." ;
 	] , [
 		a owl:Restriction ;
-		owl:onProperty lv2:symbol ;
-		owl:cardinality 1 ;
-		rdfs:comment "A port MUST have exactly one lv2:symbol." ;
-	] , [
-		a owl:Restriction ;
 		owl:onProperty lv2:name ;
 		owl:minCardinality 1 ;
 		rdfs:comment "A port MUST have at least one lv2:name." ;
@@ -262,7 +279,7 @@ lv2:port
 	a rdf:Property ,
 		owl:ObjectProperty ;
 	rdfs:domain lv2:PluginBase ;
-	rdfs:range lv2:Port ;
+	rdfs:range lv2:PortBase ;
 	rdfs:label "port" ;
 	rdfs:comment "A port (input or output) on this plugin." .
 
diff --git a/lv2/options/options.ttl b/lv2/options/options.ttl
index b0f752c..5c5860a 100644
--- a/lv2/options/options.ttl
+++ b/lv2/options/options.ttl
@@ -10,7 +10,6 @@
 	rdfs:seeAlso <options.h> ,
 		<lv2-options.doap.ttl> ;
 	lv2:documentation """
-
 <p>This extension defines a facility for <q>options</q>, which are dynamic
 properties that may be changed at run time.</p>
 
@@ -79,7 +78,7 @@ be listed as a lv2:optionalFeature.</p>
 opts:requiredOption
 	a rdf:Property ,
 		owl:ObjectProperty ;
-	rdfs:range opts:Option ;
+	rdfs:range rdf:Property ;
 	rdfs:label "required option" ;
 	lv2:documentation """
 <p>An option required by the instance to function at all.  The host MUST pass a
@@ -94,7 +93,7 @@ fall back to a reasonable default value if it is not provided.</p>
 opts:supportedOption
 	a rdf:Property ,
 		owl:ObjectProperty ;
-	rdfs:range opts:Option ;
+	rdfs:range rdf:Property ;
 	rdfs:label "supported option" ;
 	lv2:documentation """
 <p>An option supported or <q>understood</q> by the instance.  The host SHOULD
diff --git a/lv2/presets/presets.ttl b/lv2/presets/presets.ttl
index da7e9bb..a32347b 100644
--- a/lv2/presets/presets.ttl
+++ b/lv2/presets/presets.ttl
@@ -89,7 +89,7 @@ pset:bank
 
 pset:value
 	a rdf:Property ;
-	rdfs:domain lv2:Port ;
+	rdfs:domain lv2:PortBase ;
 	rdfs:label "value" ;
 	rdfs:comment """Specifies the value of a Port on some Preset.  This property is used in a similar way to e.g. lv2:default.""" .
 
diff --git a/lv2/units/units.ttl b/lv2/units/units.ttl
index e40bef6..aaae520 100644
--- a/lv2/units/units.ttl
+++ b/lv2/units/units.ttl
@@ -59,8 +59,6 @@ units:Unit
 units:unit
 	a rdf:Property ,
 		owl:ObjectProperty ;
-	rdfs:domain lv2:Port ,
-		lv2:Parameter ;
 	rdfs:range units:Unit ;
 	rdfs:label "unit" ;
 	rdfs:comment "The unit used by the value of a port or parameter." .