diff --git a/ontology/saref4auto.ttl b/ontology/saref4auto.ttl
index e1397c47f8b9bf6733b1091666f9ffbba8199b82..da27c0e49ffb1d6aa119ef695b8f3c23b9010ddb 100644
--- a/ontology/saref4auto.ttl
+++ b/ontology/saref4auto.ttl
@@ -180,15 +180,6 @@ saref:measurementMadeBy rdf:type owl:ObjectProperty ;
                         rdfs:label "measurementMadeBy"@en .
 
 
-###  https://saref.etsi.org/core/measuresProperty
-saref:measuresProperty rdf:type owl:ObjectProperty ;
-                       rdfs:domain saref:Device ;
-                       rdfs:range saref:Property ;
-                       rdfs:comment "A relationship specifying the property that can be measured by a certain device"@en ;
-                       rdfs:isDefinedBy saref: ;
-                       rdfs:label "measures property"@en .
-
-
 ###  https://saref.etsi.org/core/relatesToMeasurement
 saref:relatesToMeasurement rdf:type owl:ObjectProperty ;
                            rdfs:comment "A relationship between a property and the measurements it relates to"@en ;
@@ -757,7 +748,7 @@ saref:Device rdf:type owl:Class ;
                                owl:allValuesFrom saref:Measurement
                              ] ,
                              [ rdf:type owl:Restriction ;
-                               owl:onProperty saref:measuresProperty ;
+                               owl:onProperty saref:observes ;
                                owl:allValuesFrom saref:Property
                              ] ;
              rdfs:comment "A tangible object designed to accomplish a particular task in households, common public buildings or offices. In order to accomplish this task, the device performs one or more functions. For example, a washing machine is designed to wash (task) and to accomplish this task it performs a start and stop function. Devices can be structured in categories (subclasses) that reflect the different domain in which a device is used, e.g., smart appliances domain (subclass FunctionRelated) vs. building domain (subclass BuildingRelated) vs. smart grid domain (subclass EnergyRelated). New categories can be defined,if needed, to reflect other differences, for example different points of view, such as the point of view of the device's user vs. the point of view of the device's manufacturer. We propose a list of devices that are relevant for the purpose of SAREF, but this list can be extended."@en ;
@@ -1072,15 +1063,15 @@ saref:UnitOfMeasure rdf:type owl:Class ;
                        rdfs:subClassOf saref:Device ,
                                        s4syst:System ,
                                        [ rdf:type owl:Restriction ;
-                                         owl:onProperty saref:measuresProperty ;
+                                         owl:onProperty saref:observes ;
                                          owl:someValuesFrom :Acceleration
                                        ] ,
                                        [ rdf:type owl:Restriction ;
-                                         owl:onProperty saref:measuresProperty ;
+                                         owl:onProperty saref:observes ;
                                          owl:someValuesFrom :Heading
                                        ] ,
                                        [ rdf:type owl:Restriction ;
-                                         owl:onProperty saref:measuresProperty ;
+                                         owl:onProperty saref:observes ;
                                          owl:someValuesFrom :Speed
                                        ] ,
                                        [ rdf:type owl:Restriction ;
@@ -1606,23 +1597,23 @@ saref:UnitOfMeasure rdf:type owl:Class ;
 :RoadSideSensor rdf:type owl:Class ;
                 rdfs:subClassOf saref:Sensor ,
                                 [ rdf:type owl:Restriction ;
-                                  owl:onProperty saref:measuresProperty ;
+                                  owl:onProperty saref:observes ;
                                   owl:someValuesFrom :Heading
                                 ] ,
                                 [ rdf:type owl:Restriction ;
-                                  owl:onProperty saref:measuresProperty ;
+                                  owl:onProperty saref:observes ;
                                   owl:someValuesFrom :Height
                                 ] ,
                                 [ rdf:type owl:Restriction ;
-                                  owl:onProperty saref:measuresProperty ;
+                                  owl:onProperty saref:observes ;
                                   owl:someValuesFrom :Length
                                 ] ,
                                 [ rdf:type owl:Restriction ;
-                                  owl:onProperty saref:measuresProperty ;
+                                  owl:onProperty saref:observes ;
                                   owl:someValuesFrom :Speed
                                 ] ,
                                 [ rdf:type owl:Restriction ;
-                                  owl:onProperty saref:measuresProperty ;
+                                  owl:onProperty saref:observes ;
                                   owl:someValuesFrom :Width
                                 ] ,
                                 [ rdf:type owl:Restriction ;