diff --git a/ontology/saref.ttl b/ontology/saref.ttl
index 9e304185f2355d392ea0eacf8eda30144bce9638..08908a88749dfe8ab2a0915f511e8c91d8f2b14f 100644
--- a/ontology/saref.ttl
+++ b/ontology/saref.ttl
@@ -808,6 +808,50 @@ saref:isValueOfProperty
 
 ## Note that saref:hasPropertyValue and saref:isValueOfProperty are not inverse properties.
 
+# ETSI TS 103264 Clause 5.6.5: Composite Properties and Property Values
+
+## The OP saref:isComposedOf links a composite property or property value to its individual components. 
+
+saref:isComposedOf a owl:ObjectProperty ;
+  rdfs:label "is composed of"@en ;
+  rdfs:comment "Links a composite property or property value to its individual components."@en ;
+  rdfs:domain [ a owl:Class ; owl:unionOf ( saref:Property saref:PropertyOfInterest saref:PropertyValue ) ] ;
+  rdfs:range [ a owl:Class ; owl:unionOf ( saref:FeatureKind saref:Property saref:PropertyOfInterest saref:FeatureOfInterest saref:PropertyValue ) ] .
+
+## A feature kind or feature of interest has the individual components of its composite properties.
+
+saref:hasProperty owl:propertyChainAxiom ( saref:hasProperty saref:isComposedOf ) .
+
+## Properties can be composed of feature kinds and properties.
+
+saref:Property rdfs:subClassOf [ 
+  owl:onProperty saref:isComposedOf ; 
+  owl:allValuesFrom [ a owl:Class ; owl:unionOf ( saref:FeatureKind saref:Property ) ] ] .
+
+## Properties of interest can be composed of feature kinds, properties, and properties of interest.
+
+saref:PropertyOfInterest rdfs:subClassOf [ 
+  owl:onProperty saref:isComposedOf ; 
+  owl:allValuesFrom [ a owl:Class ; owl:unionOf ( saref:FeatureKind saref:Property saref:PropertyOfInterest ) ] ] .
+
+## Property values can be composed of features of interest and property values.
+
+saref:PropertyValue rdfs:subClassOf [ 
+  owl:onProperty saref:isComposedOf ; 
+  owl:allValuesFrom [ a owl:Class ; owl:unionOf ( saref:FeatureKind saref:Property saref:PropertyOfInterest saref:FeatureOfInterest saref:PropertyValue ) ] ] .
+
+## When composed of a property of interest, a property of interest or property value is also composed of the kinds of this property of interest.
+
+saref:isComposedOf owl:propertyChainAxiom ( saref:isComposedOf saref:hasPropertyKind ) .
+
+## When composed of a property value, a property value is also composed of that value's property.
+
+saref:isComposedOf owl:propertyChainAxiom ( saref:isComposedOf saref:isValueOfProperty ) .
+
+## When composed of a feature of interest, a property value is also composed of the kind of that feature of interest.
+
+saref:isComposedOf owl:propertyChainAxiom ( saref:isComposedOf saref:hasFeatureKind ) .
+
 
 # ETSI TS 103264 Clause 5.7: States and states of interest