diff --git a/ontology/saref4ehaw.ttl b/ontology/saref4ehaw.ttl
index 8f4c4a47f9e017eda763f4060e0a98c625f62d97..40d7c67c8633c7d07a06f4c2f746ee6873b4befc 100644
--- a/ontology/saref4ehaw.ttl
+++ b/ontology/saref4ehaw.ttl
@@ -7,7 +7,6 @@
@prefix voaf: <http://purl.org/vocommons/voaf#> .
@prefix saref: <https://saref.etsi.org/core/> .
@prefix s4ehaw: <https://saref.etsi.org/saref4ehaw/> .
-@prefix ssn-system: <http://www.w3.org/ns/ssn/systems/> .
@prefix dcterms: <http://purl.org/dc/terms/> .
@base <https://saref.etsi.org/saref4ehaw/> .
@@ -97,13 +96,6 @@ vann:preferredNamespaceUri rdf:type owl:AnnotationProperty .
#################################################################
-### https://saref.etsi.org/core/consistsOf
-saref:consistsOf rdf:type owl:ObjectProperty ;
- rdfs:comment "A relationship indicating a composite entity that consists of other entities (e.g., a temperature/humidity sensor that consists of a temperature sensor and a humidity sensor)"@en ;
- rdfs:isDefinedBy saref: ;
- rdfs:label "consists of"@en .
-
-
### https://saref.etsi.org/saref4ehaw/contains
s4ehaw:contains rdf:type owl:ObjectProperty ;
rdfs:domain s4ehaw:Ban ;
@@ -352,14 +344,6 @@ s4ehaw:groundingProtocol rdf:type owl:ObjectProperty ;
rdfs:label "grounding protocol"@en .
-### https://saref.etsi.org/saref4ehaw/precision
-s4ehaw:precision rdf:type owl:ObjectProperty ;
- rdfs:domain s4ehaw:MeasurementFunction ;
- rdfs:range ssn-system:Precision ;
- rdfs:comment "Precision refers to the degree of reproducibility of a measured quantity (when the same quantity is measured several times how close are the measurements from each other)."@en ;
- rdfs:label "precision"@en .
-
-
### https://saref.etsi.org/saref4ehaw/presents
s4ehaw:presents rdf:type owl:ObjectProperty ;
rdfs:domain saref:Service ;
@@ -583,13 +567,6 @@ s4ehaw:hasInput rdf:type owl:DatatypeProperty ;
rdfs:label "has input"@en .
-### https://saref.etsi.org/core/hasManufacturer
-saref:hasManufacturer rdf:type owl:DatatypeProperty ;
- rdfs:comment "A relationship identifying the manufacturer of an entity (e.g., device). The value is expected to be a string or a string with language tag."@en ;
- rdfs:isDefinedBy saref: ;
- rdfs:label "has manufacturer"@en .
-
-
### https://saref.etsi.org/saref4ehaw/hasMbox
s4ehaw:hasMbox rdf:type owl:DatatypeProperty ;
rdfs:domain s4ehaw:HealthActor ;
@@ -1196,46 +1173,6 @@ s4ehaw:ValidityConstraint rdf:type owl:Class ;
rdfs:label "Validity constraint"@en .
-### https://saref.etsi.org/saref/core/Command
-saref:Command rdf:type owl:Class .
-
-
-### https://saref.etsi.org/saref/core/Device
-saref:Device rdf:type owl:Class .
-
-
-### https://saref.etsi.org/saref/core/Function
-saref:Function rdf:type owl:Class .
-
-
-### https://saref.etsi.org/saref/core/Measurement
-saref:Measurement rdf:type owl:Class .
-
-
-### https://saref.etsi.org/saref/core/NotifyCommand
-saref:NotifyCommand rdf:type owl:Class .
-
-
-### http://www.w3.org/ns/ssn/systems/Precision
-ssn-system:Precision rdf:type owl:Class .
-
-
-### https://saref.etsi.org/saref/core/Property
-saref:Property rdf:type owl:Class .
-
-
-### https://saref.etsi.org/saref/core/Service
-saref:Service rdf:type owl:Class .
-
-
-### https://saref.etsi.org/saref/core/Task
-saref:Task rdf:type owl:Class .
-
-
-### https://saref.etsi.org/saref/core/UnitOfMeasure
-saref:UnitOfMeasure rdf:type owl:Class .
-
-
#################################################################
# Individuals
#################################################################
@@ -1436,6 +1373,12 @@ s4ehaw:WristLocation rdf:type owl:NamedIndividual ,
rdfs:label "Wrist location"@en .
+### https://saref.etsi.org/saref4ehaw/Precision
+s4ehaw:Precision rdf:type owl:NamedIndividual , saref:Property ;
+ rdfs:comment "Precision refers to the degree of reproducibility of a measured quantity (when the same quantity is measured several times how close are the measurements from each other)."@en ;
+ rdfs:label "Precision"@en .
+
+
### https://saref.etsi.org/saref4ehaw/Prevention
s4ehaw:Prevention rdf:type owl:NamedIndividual ,
s4ehaw:BanApplicationDomain ;