diff --git a/ontology/saref4auto.ttl b/ontology/saref4auto.ttl
index 767c6661f44c304c6ddf60c3607cea8e60b2f809..49d389da6e6a679ab785aea5ee85f3bff15cbdde 100644
--- a/ontology/saref4auto.ttl
+++ b/ontology/saref4auto.ttl
@@ -104,42 +104,46 @@ vann:preferredNamespaceUri rdf:type owl:AnnotationProperty .
                rdfs:label "hasConfidence"@en .
 
 
-###  https://saref.etsi.org/saref4auto/hasEnvironment
 :hasEnvironment rdf:type owl:ObjectProperty ;
-                rdfs:comment "A relation that allows to describe the environment of a vehicle"@en ;
-                rdfs:label "hasEnvironment"@en .
+  rdfs:range :VehicleEnvironment ;
+  rdfs:comment "A relation that allows to describe the environment of a vehicle"@en ;
+  rdfs:label "has Environment"@en .
 
 
 ###  https://saref.etsi.org/saref4auto/hasOpeningTimeAvailability
 :hasOpeningTimeAvailability rdf:type owl:ObjectProperty ;
-                            rdfs:comment "A relation to express the opening time of parking spot"@en ;
-                            rdfs:label "hasOpeningTimeAvailability"@en .
+  rdfs:range time:TemporalEntity ;
+  rdfs:comment "A relation to express the opening time of parking spot"@en ;
+  rdfs:label "hasOpeningTimeAvailability"@en .
 
 
 ###  https://saref.etsi.org/saref4auto/hasPlatoonRole
 :hasPlatoonRole rdf:type owl:ObjectProperty ;
-                rdfs:subPropertyOf :hasRole ;
-                rdfs:comment "A relation to specify that in a platoon a vehicle can assume roles such as: unknown, leader, follower, ready-for-leading, trailing, etc."@en ;
-                rdfs:label "hasPlatoonRole"@en .
+  rdfs:subPropertyOf :hasRole ;
+  rdfs:range :PlatoonRole ;
+  rdfs:comment "A relation to specify that in a platoon a vehicle can assume roles such as: unknown, leader, follower, ready-for-leading, trailing, etc."@en ;
+  rdfs:label "hasPlatoonRole"@en .
 
 
 ###  https://saref.etsi.org/saref4auto/hasRole
 :hasRole rdf:type owl:ObjectProperty ;
-         rdfs:range :Role ;
-         rdfs:comment "A general relation to express that an entity can have a role"@en ;
-         rdfs:label "hasRole"@en .
+  rdfs:range :Role ;
+  rdfs:comment "A general relation to express that an entity can have a role"@en ;
+  rdfs:label "hasRole"@en .
 
 
 ###  https://saref.etsi.org/saref4auto/isConfidenceOf
 :isConfidenceOf rdf:type owl:ObjectProperty ;
-                rdfs:comment "A relation between the confidence (s4auto:Confidence class) of some entity (ex. an observation) and that entity"@en ;
-                rdfs:label "isConfidenceOf"@en .
+  rdfs:domain :Confidence ;
+  rdfs:comment "A relation between the confidence (s4auto:Confidence class) of some entity (ex. an observation) and that entity"@en ;
+  rdfs:label "isConfidenceOf"@en .
 
 
 ###  https://saref.etsi.org/saref4auto/usesProperty
 :usesProperty rdf:type owl:ObjectProperty ;
-                 rdfs:comment "A relation to express that a device can use different types of properties, such as speed, position of detected road objects (e.g., bicycles, vehicles). This applies in particular to the ElectronicControlUnit and TrafficLightController classes."@en ;
-                 rdfs:label "usesProperty"@en .
+  rdfs:range :Property ;
+  rdfs:comment "A relation to express that a device can use different types of properties, such as speed, position of detected road objects (e.g., bicycles, vehicles). This applies in particular to the ElectronicControlUnit and TrafficLightController classes."@en ;
+  rdfs:label "usesProperty"@en .
 
 
 #################################################################
@@ -166,8 +170,9 @@ vann:preferredNamespaceUri rdf:type owl:AnnotationProperty .
 
 ###  https://saref.etsi.org/saref4auto/hasMaxSize
 :hasMaxSize rdf:type owl:DatatypeProperty ;
-            rdfs:comment "A relation to express the max size of a platoon. Note that it is defined as a datatype property as this is a fixed/static value of the platoon that does not change over time. In contrast, the current size of the platoon may change over time and is therefore defined as a property (see s4auto:PlatoonSize)."@en ;
-            rdfs:label "hasMaxSize"@en .
+  rdfs:range xsd:integer ;
+  rdfs:comment "A relation to express the max size of a platoon. Note that it is defined as a datatype property as this is a fixed/static value of the platoon that does not change over time. In contrast, the current size of the platoon may change over time and is therefore defined as a property (see s4auto:PlatoonSize)."@en ;
+  rdfs:label "hasMaxSize"@en .
 
 
 #################################################################
@@ -383,7 +388,7 @@ vann:preferredNamespaceUri rdf:type owl:AnnotationProperty .
                          ] ,
                          [ rdf:type owl:Restriction ;
                            owl:onProperty :hasMaxSize ;
-                           owl:someValuesFrom xsd:int
+                           owl:cardinality 1
                          ] ;
          rdfs:comment "A group of vehicles automatically following each other at a relatively close distance" ;
          rdfs:label "Platoon"@en .