diff --git a/classes/fiafcore-activity.ttl b/classes/fiafcore-activity.ttl
index 4333122..ec70798 100644
--- a/classes/fiafcore-activity.ttl
+++ b/classes/fiafcore-activity.ttl
@@ -12,8 +12,38 @@
     rdfs:label "Activité"@fr ;
     dc:source "FIAF Cataloguing Manual 1.4.1.1"^^xsd:string .
 
+# Parent relations
+
+<https://fiafcore.org/ontology/hasActivity> a owl:ObjectProperty ;
+    rdfs:label "Has Activity"@en ;
+    rdfs:label "Tiene Actividad"@es ;
+    rdfs:label "A une Activité"@fr ;
+    dc:source "FIAF Cataloguing Manual 1.4.1.1, 2.4.1.1, 3.3.1.1"^^xsd:string ;
+    rdfs:domain fiaf:Event ;
+    rdfs:range fiaf:Activity .
+
+_:isActivityOf owl:inverseOf fiaf:hasActivity .
+
 # Subclasses
 
+<https://fiafcore.org/ontology/ItemActivity> a owl:Restriction ;
+    dc:source "FIAF Cataloguing Manual 3.3.1.1"^^xsd:string ;
+    owl:onProperty _:isActivityOf ;
+    owl:someValuesFrom fiaf:ItemEvent .
+
+<https://fiafcore.org/ontology/ManifestationActivity> a owl:Restriction ;
+    rdfs:label "Manifestation Activity"@en ;
+    rdfs:label "Manifestación Actividad"@es ;
+    rdfs:label "Activité de manifestation"@fr ;
+    dc:source "FIAF Cataloguing Manual 2.4.1.1"^^xsd:string ;
+    owl:onProperty _:isActivityOf ;
+    owl:someValuesFrom fiaf:ManifestationEvent .
+
+<https://fiafcore.org/ontology/WorkVariantActivity> a owl:Restriction ;
+    dc:source "FIAF Cataloguing Manual 1.4.1.1"^^xsd:string ;
+    owl:onProperty _:isActivityOf ;
+    owl:someValuesFrom fiaf:WorkVariantEvent .
+
 <https://fiafcore.org/ontology/Adaptation> a owl:Class ;
     rdfs:label "Adaptation"@en,
         "Adaptación"@es,
@@ -348,7 +378,8 @@
         "Distribuidor"@es,
         "Distributeur"@fr ;
     dc:source "FIAF Glossary of Filmographic Terms C.2.3"^^xsd:string ;
-    rdfs:subClassOf <https://fiafcore.org/ontology/CopyrightandDistributionActivity> .
+    rdfs:subClassOf fiaf:CopyrightandDistributionActivity,
+        fiaf:ManifestationActivity .
 
 <https://fiafcore.org/ontology/DollyGrip> a owl:Class ;
     rdfs:label "Dolly Grip"@en,
@@ -656,7 +687,8 @@
         "Distribuidor nacional"@es,
         "Distributeur national"@fr ;
     dc:source "FIAF Glossary of Filmographic Terms C.2.6"^^xsd:string ;
-    rdfs:subClassOf <https://fiafcore.org/ontology/CopyrightandDistributionActivity> .
+    rdfs:subClassOf fiaf:CopyrightandDistributionActivity,
+        fiaf:ManifestationActivity .
 
 <https://fiafcore.org/ontology/NegativeCutter> a owl:Class ;
     rdfs:label "Negative Cutter"@en,
@@ -670,14 +702,16 @@
         "Propietario original del derecho de autor"@es,
         "Ayant droit d'origine"@fr ;
     dc:source "FIAF Glossary of Filmographic Terms C.2.1"^^xsd:string ;
-    rdfs:subClassOf <https://fiafcore.org/ontology/CopyrightandDistributionActivity> .
+    rdfs:subClassOf fiaf:CopyrightandDistributionActivity,
+        fiaf:WorkVariantActivity .
 
 <https://fiafcore.org/ontology/OriginalDistributor> a owl:Class ;
     rdfs:label "Original Distributor"@en,
         "Distribuidor original"@es,
         "Distributeur initial"@fr ;
     dc:source "FIAF Glossary of Filmographic Terms C.2.4"^^xsd:string ;
-    rdfs:subClassOf <https://fiafcore.org/ontology/CopyrightandDistributionActivity> .
+    rdfs:subClassOf fiaf:CopyrightandDistributionActivity,
+        fiaf:ManifestationActivity .
 
 <https://fiafcore.org/ontology/PostProductionSupervisor> a owl:Class ;
     rdfs:label "Post-Production Supervisor"@en,
@@ -691,7 +725,8 @@
         "Propietario actual del derecho de autor"@es,
         "Ayant droit actuel"@fr ;
     dc:source "FIAF Glossary of Filmographic Terms C.2.2"^^xsd:string ;
-    rdfs:subClassOf <https://fiafcore.org/ontology/CopyrightandDistributionActivity> .
+    rdfs:subClassOf fiaf:CopyrightandDistributionActivity,
+        fiaf:WorkVariantActivity .
 
 <https://fiafcore.org/ontology/Presenter> a owl:Class ;
     rdfs:label "Presenter"@en,
@@ -1076,112 +1111,107 @@
         "Actividad de censura y calificación"@es,
         "Activité de censure "@fr ;
     dc:source "FIAF Glossary of Filmographic Terms C.1"^^xsd:string ;
-    rdfs:subClassOf <https://fiafcore.org/ontology/Activity> .
+    rdfs:subClassOf fiaf:WorkVariantActivity .
 
 <https://fiafcore.org/ontology/PuppetActivity> a owl:Class ;
     rdfs:label "Puppet Activity"@en,
         "Actividad de marionetas"@es,
         "Activité de marionnettes"@fr ;
     dc:source "FIAF Glossary of Filmographic Terms B.14"^^xsd:string ;
-    rdfs:subClassOf <https://fiafcore.org/ontology/Activity> .
+    rdfs:subClassOf fiaf:WorkVariantActivity .
 
 <https://fiafcore.org/ontology/EditingActivity> a owl:Class ;
     rdfs:label "Editing Activity"@en,
         "Actividad de montaje"@es,
         "Activité de montage"@fr ;
     dc:source "FIAF Glossary of Filmographic Terms B.10"^^xsd:string ;
-    rdfs:subClassOf <https://fiafcore.org/ontology/Activity> .
+    rdfs:subClassOf fiaf:WorkVariantActivity .
 
 <https://fiafcore.org/ontology/LaboratoryActivity> a owl:Class ;
     rdfs:label "Laboratory Activity"@en,
         "Actividad de laboratorio"@es,
         "Activité de laboratoire"@fr ;
     dc:source "FIAF Glossary of Filmographic Terms B.12"^^xsd:string ;
-    rdfs:subClassOf <https://fiafcore.org/ontology/Activity> .
+    rdfs:subClassOf fiaf:WorkVariantActivity .
 
 <https://fiafcore.org/ontology/CopyrightandDistributionActivity> a owl:Class ;
     rdfs:label "Copyright and Distribution Activity"@en,
         "Actividad de derecho de autor y distribución"@es,
         "Activité de copyright et distribution"@fr ;
     dc:source "FIAF Glossary of Filmographic Terms C.2"^^xsd:string ;
-    rdfs:subClassOf <https://fiafcore.org/ontology/Activity> .
+    rdfs:subClassOf [
+        owl:unionOf (fiaf:ManifestationActivity fiaf:WorkVariantActivity)
+    ] .
 
 <https://fiafcore.org/ontology/DirectingActivity> a owl:Class ;
     rdfs:label "Directing Activity"@en,
         "Actividad de dirección"@es,
         "Activité de réalisation"@fr ;
     dc:source "FIAF Glossary of Filmographic Terms B.3"^^xsd:string ;
-    rdfs:subClassOf <https://fiafcore.org/ontology/Activity> .
+    rdfs:subClassOf fiaf:WorkVariantActivity .
 
 <https://fiafcore.org/ontology/AnimationActivity> a owl:Class ;
     rdfs:label "Animation Activity"@en,
         "Actividad de Animación"@es,
         "Activité d'animation"@fr ;
     dc:source "FIAF Glossary of Filmographic Terms B.13"^^xsd:string ;
-    rdfs:subClassOf <https://fiafcore.org/ontology/Activity> .
+    rdfs:subClassOf fiaf:WorkVariantActivity .
 
 <https://fiafcore.org/ontology/WritingActivity> a owl:Class ;
     rdfs:label "Writing Activity"@en,
         "Actividad de texto"@es,
         "Activité d'écriture"@fr ;
     dc:source "FIAF Glossary of Filmographic Terms B.4"^^xsd:string ;
-    rdfs:subClassOf <https://fiafcore.org/ontology/Activity> .
+    rdfs:subClassOf fiaf:WorkVariantActivity .
 
 <https://fiafcore.org/ontology/MusicActivity> a owl:Class ;
     rdfs:label "Music Activity"@en,
         "Actividad de música"@es,
         "Activité de musique"@fr ;
     dc:source "FIAF Glossary of Filmographic Terms B.11"^^xsd:string ;
-    rdfs:subClassOf <https://fiafcore.org/ontology/Activity> .
+    rdfs:subClassOf fiaf:WorkVariantActivity .
 
 <https://fiafcore.org/ontology/SpecialEffectsActivity> a owl:Class ;
     rdfs:label "Special Effects Activity"@en,
         "Actividad de trucajes"@es,
         "Activité de trucages"@fr ;
     dc:source "FIAF Glossary of Filmographic Terms B.8"^^xsd:string ;
-    rdfs:subClassOf <https://fiafcore.org/ontology/Activity> .
+    rdfs:subClassOf fiaf:WorkVariantActivity .
 
 <https://fiafcore.org/ontology/CastActivity> a owl:Class ;
     rdfs:label "Cast Activity"@en,
         "Actividad de reparto"@es,
         "Activité d’interprétation"@fr ;
     dc:source "FIAF Glossary of Filmographic Terms B.7"^^xsd:string ;
-    rdfs:subClassOf <https://fiafcore.org/ontology/Activity> .
+    rdfs:subClassOf fiaf:WorkVariantActivity .
 
 <https://fiafcore.org/ontology/SoundActivity> a owl:Class ;
     rdfs:label "Sound Activity"@en,
         "Actividad de sonido"@es,
         "Activité de son"@fr ;
     dc:source "FIAF Glossary of Filmographic Terms B.9"^^xsd:string ;
-    rdfs:subClassOf <https://fiafcore.org/ontology/Activity> .
+    rdfs:subClassOf fiaf:WorkVariantActivity .
 
 <https://fiafcore.org/ontology/CinematographyActivity> a owl:Class ;
     rdfs:label "Cinematography Activity"@en,
         "Actividad de fotografía"@es,
         "Activité de photographie"@fr ;
     dc:source "FIAF Glossary of Filmographic Terms B.5"^^xsd:string ;
-    rdfs:subClassOf <https://fiafcore.org/ontology/Activity> .
+    rdfs:subClassOf fiaf:WorkVariantActivity .
 
 <https://fiafcore.org/ontology/ProducingActivity> a owl:Class ;
     rdfs:label "Producing Activity"@en,
         "Actividad de producción"@es,
         "Activité de production"@fr ;
     dc:source "FIAF Glossary of Filmographic Terms B.2"^^xsd:string ;
-    rdfs:subClassOf <https://fiafcore.org/ontology/Activity> .
+    rdfs:subClassOf fiaf:WorkVariantActivity .
 
 <https://fiafcore.org/ontology/ProductionDesignActivity> a owl:Class ;
     rdfs:label "Production Design Activity"@en,
         "Actividad de diseño de producción"@es,
         "Activité de supervision artistique"@fr ;
     dc:source "FIAF Glossary of Filmographic Terms B.6"^^xsd:string ;
-    rdfs:subClassOf <https://fiafcore.org/ontology/Activity> .
-
-<https://fiafcore.org/ontology/ManifestationActivity> a owl:Class ;
-    rdfs:label "Manifestation Activity"@en ;
-    rdfs:label "Manifestación Actividad"@es ;
-    rdfs:label "Activité de manifestation"@fr ;
-    dc:source "FIAF Cataloguing Manual 2.4.1.1"^^xsd:string ;
-    rdfs:subClassOf fiaf:Activity .
+    rdfs:subClassOf fiaf:WorkVariantActivity .
 
 <https://fiafcore.org/ontology/DistributorTheatrical> a owl:Class ;
     rdfs:label "Distributor (theatrical)"@en ,
diff --git a/classes/fiafcore-event.ttl b/classes/fiafcore-event.ttl
index c614490..4d181bc 100644
--- a/classes/fiafcore-event.ttl
+++ b/classes/fiafcore-event.ttl
@@ -12,14 +12,45 @@
     rdfs:label "Événement"@fr ;
     dc:source "FIAF Cataloguing Manual 1.4.2, 2.4.2, 3.3.2"^^xsd:string .
 
+# Parent relations
+
+<https://fiafcore.org/ontology/hasEvent> a owl:ObjectProperty ;
+    rdfs:label "Has Event"@en ;
+    rdfs:label "Tiene un Evento"@es ;
+    rdfs:label "A un Évènement"@fr ;
+    dc:source "FIAF Cataloguing Manual 1.4.2, 2.4.2, 3.3.2"^^xsd:string ;
+    rdfs:domain [
+        owl:unionOf (fiaf:Carrier fiaf:Item fiaf:Manifestation fiaf:WorkVariant)
+    ] ;
+    rdfs:range fiaf:Event .
+
+_:isEventOf owl:inverseOf fiaf:hasEvent .
+
 # Subclasses
 
+<https://fiafcore.org/ontology/ItemEvent> a owl:Restriction ;
+    dc:source "FIAF Cataloguing Manual 3.3.2"^^xsd:string ;
+    owl:onProperty _:isEventOf ;
+    owl:someValuesFrom fiaf:Item .
+
+<https://fiafcore.org/ontology/ManifestationEvent> a owl:Restriction ;
+    dc:source "FIAF Cataloguing Manual 2.4.2"^^xsd:string ;
+    owl:onProperty _:isEventOf ;
+    owl:someValuesFrom fiaf:Manifestation .
+
+<https://fiafcore.org/ontology/WorkVariantEvent> a owl:Restriction ;
+    dc:source "FIAF Cataloguing Manual 1.4.2"^^xsd:string ;
+    owl:onProperty _:isEventOf ;
+    owl:someValuesFrom fiaf:WorkVariant .
+
 <https://fiafcore.org/ontology/PublicationEvent> a owl:Class ;
     rdfs:label "Publication Event"@en ;
     rdfs:label "Publicación Evento"@es ;
     rdfs:label "Publication Événement"@fr ;
     dc:source "FIAF Cataloguing Manual D.4.1"^^xsd:string ;
-    rdfs:subClassOf fiaf:Event .
+    rdfs:subClassOf [
+        owl:unionOf (fiaf:ManifestationEvent fiaf:WorkVariantEvent)
+    ] .
 
 <https://fiafcore.org/ontology/ReleaseEvent> a owl:Class ;
     rdfs:label "Release Event"@en ;
@@ -96,14 +127,18 @@
     rdfs:label "Premio(s) o Nominación(es) Evento"@es ;
     rdfs:label "Récompense(s) ou nomination(s)"@fr ;
     dc:source "FIAF Cataloguing Manual D.4.2"^^xsd:string ;
-    rdfs:subClassOf fiaf:Event .
+    rdfs:subClassOf [
+        owl:unionOf (fiaf:ManifestationEvent fiaf:WorkVariantEvent)
+    ] .
 
 <https://fiafcore.org/ontology/ProductionEvent> a owl:Class ;
     rdfs:label "Production Event"@en ;
     rdfs:label "Producción Evento"@es ;
     rdfs:label "Production Événement"@fr ;
     dc:source "FIAF Cataloguing Manual D.4.3"^^xsd:string ;
-    rdfs:subClassOf fiaf:Event .
+    rdfs:subClassOf [
+        owl:unionOf (fiaf:ManifestationEvent fiaf:WorkVariantEvent)
+    ] .
 
 <https://fiafcore.org/ontology/CastingEvent> a owl:Class ;
     rdfs:label "Casting Event"@en ;
@@ -138,7 +173,7 @@
     rdfs:label "Derechos/Copyright/Registro de Propiedad Intelectual Evento"@es ;
     rdfs:label "Droits/Copyright/Déclaration DPI Événement"@fr ;
     dc:source "FIAF Cataloguing Manual D.4.4"^^xsd:string ;
-    rdfs:subClassOf fiaf:Event .
+    rdfs:subClassOf fiaf:WorkVariantEvent .
 
 <https://fiafcore.org/ontology/PreservationEvent> a owl:Class ;
     rdfs:label "Preservation Event"@en ;
@@ -180,7 +215,7 @@
     rdfs:label "Decisión Evento"@es ;
     rdfs:label "Décision Événement"@fr ;
     dc:source "FIAF Cataloguing Manual D.4.6"^^xsd:string ;
-    rdfs:subClassOf fiaf:Event .
+    rdfs:subClassOf fiaf:ManifestationEvent .
 
 <https://fiafcore.org/ontology/CensorshipEvent> a owl:Class ;
     rdfs:label "Censorship Event"@en ;
@@ -208,7 +243,7 @@
     rdfs:label "Manufactura Evento"@es ;
     rdfs:label "Fabrication Événement"@fr ;
     dc:source "FIAF Cataloguing Manual D.4.7"^^xsd:string ;
-    rdfs:subClassOf fiaf:Event .
+    rdfs:subClassOf fiaf:ManifestationEvent .
     
 <https://fiafcore.org/ontology/FilmPrintingEvent> a owl:Class ;
     rdfs:label "Film Printing Event"@en ;
@@ -257,14 +292,14 @@
     rdfs:label "Inspección Evento"@es ;
     rdfs:label "Contrôle Événement"@fr ;
     dc:source "FIAF Cataloguing Manual D.4.8"^^xsd:string ;
-    rdfs:subClassOf fiaf:Event .
+    rdfs:subClassOf fiaf:ItemEvent .
 
 <https://fiafcore.org/ontology/AcquisitionEvent> a owl:Class ;
     rdfs:label "Acquisition Event"@en ;
     rdfs:label "Adquisición Evento"@es ;
     rdfs:label "Acquisition Événement"@fr ;
     dc:source "FIAF Cataloguing Manual D.4.9"^^xsd:string ;
-    rdfs:subClassOf fiaf:Event .
+    rdfs:subClassOf fiaf:ItemEvent .
 
 <https://fiafcore.org/ontology/DonationEvent> a owl:Class ;
     rdfs:label "Donation Event"@en ;
@@ -303,14 +338,6 @@
     
 # Object Properties
 
-<https://fiafcore.org/ontology/hasActivity> a owl:ObjectProperty ;
-    rdfs:label "Has Activity"@en ;
-    rdfs:label "Tiene Actividad"@es ;
-    rdfs:label "A une Activité"@fr ;
-    dc:source "FIAF Cataloguing Manual 1.4.1.1, 2.4.1.1, 3.3.1.1"^^xsd:string ;
-    rdfs:domain fiaf:Event ;
-    rdfs:range fiaf:Activity .
-
 <https://fiafcore.org/ontology/hasCondition> a owl:ObjectProperty ;
     rdfs:label "Has Condition"@en ;
     rdfs:label "Tiene Condición"@es ;
diff --git a/classes/fiafcore-workvariant.ttl b/classes/fiafcore-workvariant.ttl
index c5576d8..266399b 100644
--- a/classes/fiafcore-workvariant.ttl
+++ b/classes/fiafcore-workvariant.ttl
@@ -52,16 +52,6 @@
     rdfs:domain fiaf:WorkVariant ;
     rdfs:range fiaf:Country .
 
-<https://fiafcore.org/ontology/hasEvent> a owl:ObjectProperty ;
-    rdfs:label "Has Event"@en ;
-    rdfs:label "Tiene un Evento"@es ;
-    rdfs:label "A un Évènement"@fr ;
-    dc:source "FIAF Cataloguing Manual 1.4.2, 2.4.2, 3.3.2"^^xsd:string ;
-    rdfs:domain [
-        owl:unionOf (fiaf:WorkVariant fiaf:Manifestation fiaf:Item fiaf:Carrier)
-    ] ;
-    rdfs:range fiaf:Event .
-
 <https://fiafcore.org/ontology/hasGenre> a owl:ObjectProperty ;
     rdfs:label "Has Genre"@en ;
     rdfs:label "Tiene un Género"@es ;