diff --git a/ontology/saref.ttl b/ontology/saref.ttl
index 9e8ca38bc787491f31c2691f2b4b15f19c94cbe9..203d4cbdae8341059d3e188a673aef739c67f956 100644
--- a/ontology/saref.ttl
+++ b/ontology/saref.ttl
@@ -426,10 +426,6 @@ saref:Device rdf:type owl:Class ;
 ###  https://saref.etsi.org/DoorSwitch
 saref:DoorSwitch rdf:type owl:Class ;
                  rdfs:subClassOf saref:Switch ,
-                                 [ rdf:type owl:Restriction ;
-                                   owl:onProperty saref:consistsOf ;
-                                   owl:someValuesFrom saref:Switch
-                                 ] ,
                                  [ rdf:type owl:Restriction ;
                                    owl:onProperty saref:hasFunction ;
                                    owl:someValuesFrom saref:OpenCloseFunction
@@ -438,7 +434,7 @@ saref:DoorSwitch rdf:type owl:Class ;
                                    owl:onProperty saref:hasState ;
                                    owl:someValuesFrom saref:OpenCloseState
                                  ] ;
-                 rdfs:comment "A device of category saref:Actuator that consists of a switch, performs the saref:OpenCloseFunction, is used for controlling a door, and can be found in the state saref:OpenCloseState. A saref:DoorSwitch is typically used to accomplish saref:Safety."^^xsd:string ;
+                 rdfs:comment "A switch that performs the saref:OpenCloseFunction, is used for controlling a door, and can be found in the state saref:OpenCloseState. A saref:DoorSwitch is typically used to accomplish saref:Safety."^^xsd:string ;
                  rdfs:label "Door switch"^^xsd:string .
 
 
@@ -459,15 +455,11 @@ saref:Energy rdf:type owl:Class ;
 ###  https://saref.etsi.org/EnergyMeter
 saref:EnergyMeter rdf:type owl:Class ;
                   rdfs:subClassOf saref:Meter ,
-                                  [ rdf:type owl:Restriction ;
-                                    owl:onProperty saref:consistsOf ;
-                                    owl:someValuesFrom saref:Meter
-                                  ] ,
                                   [ rdf:type owl:Restriction ;
                                     owl:onProperty saref:measuresProperty ;
                                     owl:someValuesFrom saref:Energy
                                   ] ;
-                  rdfs:comment "An energy meter is a device of category saref:Meter that consists of a meter, performs the saref:MeteringFunction and is used for the purpose of measuring the saref:Energy property. A saref:EnergyMeter is typically used to accomplish saref:EnergyEfficiency, and saref:MeterReading."^^xsd:string ;
+                  rdfs:comment "An energy meter is a meter that performs the saref:MeteringFunction and is used for the purpose of measuring the saref:Energy property. A saref:EnergyMeter is typically used to accomplish saref:EnergyEfficiency, and saref:MeterReading."^^xsd:string ;
                   rdfs:label "Energy meter"^^xsd:string .
 
 
@@ -616,10 +608,6 @@ saref:Light rdf:type owl:Class ;
 ###  https://saref.etsi.org/LightSwitch
 saref:LightSwitch rdf:type owl:Class ;
                   rdfs:subClassOf saref:Switch ,
-                                  [ rdf:type owl:Restriction ;
-                                    owl:onProperty saref:consistsOf ;
-                                    owl:someValuesFrom saref:Switch
-                                  ] ,
                                   [ rdf:type owl:Restriction ;
                                     owl:onProperty saref:hasFunction ;
                                     owl:someValuesFrom saref:OnOffFunction
@@ -1042,10 +1030,6 @@ saref:Smoke rdf:type owl:Class ;
 ###  https://saref.etsi.org/SmokeSensor
 saref:SmokeSensor rdf:type owl:Class ;
                   rdfs:subClassOf saref:Sensor ,
-                                  [ rdf:type owl:Restriction ;
-                                    owl:onProperty saref:consistsOf ;
-                                    owl:someValuesFrom saref:Sensor
-                                  ] ,
                                   [ rdf:type owl:Restriction ;
                                     owl:onProperty saref:hasFunction ;
                                     owl:someValuesFrom saref:EventFunction
@@ -1058,7 +1042,7 @@ saref:SmokeSensor rdf:type owl:Class ;
                                     owl:onProperty saref:measuresProperty ;
                                     owl:someValuesFrom saref:Smoke
                                   ] ;
-                  rdfs:comment "A device that consists of a sensor, has category saref:Sensor, performs the saref:SensingFunction and saref:EventFunction (which notifies that a certain threshold has been exceeded), and is used for the purpose of sensing a property of type saref:Smoke. A saref:SmokeSensor is typically used to saref:accomplish saref:Safety."^^xsd:string ;
+                  rdfs:comment "A sensor that performs the saref:SensingFunction and saref:EventFunction (which notifies that a certain threshold has been exceeded), and is used for the purpose of sensing a property of type saref:Smoke. A saref:SmokeSensor is typically used to saref:accomplish saref:Safety."^^xsd:string ;
                   rdfs:label "Smoke sensor"^^xsd:string .
 
 
@@ -1195,10 +1179,6 @@ saref:Temperature rdf:type owl:Class ;
 ###  https://saref.etsi.org/TemperatureSensor
 saref:TemperatureSensor rdf:type owl:Class ;
                         rdfs:subClassOf saref:Sensor ,
-                                        [ rdf:type owl:Restriction ;
-                                          owl:onProperty saref:consistsOf ;
-                                          owl:someValuesFrom saref:Sensor
-                                        ] ,
                                         [ rdf:type owl:Restriction ;
                                           owl:onProperty saref:hasFunction ;
                                           owl:someValuesFrom saref:SensingFunction
@@ -1207,7 +1187,7 @@ saref:TemperatureSensor rdf:type owl:Class ;
                                           owl:onProperty saref:measuresProperty ;
                                           owl:someValuesFrom saref:Temperature
                                         ] ;
-                        rdfs:comment "A device that consists of a sensor, has category saref:Sensor, performs the saref:SensingFunction and is used for the purpose of sensing a property of type saref:Temperature. A saref:TemperatureSensor is typically used to saref:accomplish saref:Comfort."^^xsd:string ;
+                        rdfs:comment "A sensor that is used for the purpose of sensing a property of type saref:Temperature. A saref:TemperatureSensor is typically used to saref:accomplish saref:Comfort."^^xsd:string ;
                         rdfs:label "Temperature sensor"^^xsd:string .