diff --git a/ssn/chapters/Common.html b/ssn/chapters/Common.html
index d942ab70..906769b1 100644
--- a/ssn/chapters/Common.html
+++ b/ssn/chapters/Common.html
@@ -1600,8 +1600,8 @@ <h6><a href="#SOSASystem">sosa:System</a></h6>
                             <span about="[_:System3]" typeof="owl:Restriction"></span>
                             <span about="[_:System3]" rel="owl:onProperty" resource="sosa:hasSystemKind"><a
                                     href="#SOSAhasSystemKind">sosa:hasSystemKind</a></span>
-                            <span about="[_:System3]" property="owl:maxCardinality" content="1"
-                                datatype="xsd:nonNegativeInteger"><em><b>MAX 1</b></em> <a
+                            <span about="[_:System3]" property="owl:minCardinality" content="1"
+                                datatype="xsd:nonNegativeInteger"><em><b>MIN 1</b></em> <a
                                     href="#SOSASystemKind">sosa:SystemKind</a></span>
                             <br>
                             <span about="sosa:System" rel="rdfs:subClassOf" resource="[_:System4]"></span>
@@ -1969,8 +1969,8 @@ <h6><a href="#SOSAPlatform">sosa:Platform</a></h6>
                             <span about="[_:SOSAPlatform3]" typeof="owl:Restriction"></span>
                             <span about="[_:SOSAPlatform3]" rel="owl:onProperty" resource="sosa:hasSystemKind"><a
                                     href="#SOSAhasSystemKind">sosa:hasSystemKind</a></span>
-                            <span about="[_:#SOSAhasSystemKind]" property="owl:maxCardinality" content="1"
-                                datatype="xsd:nonNegativeInteger"><em><b>MAX 1</b></em> <a
+                            <span about="[_:#SOSAhasSystemKind]" property="owl:minCardinality" content="1"
+                                datatype="xsd:nonNegativeInteger"><em><b>MIN 1</b></em> <a
                                     href="#SOSAPlatformKind">sosa:PlatformKind</a></span>
                             <br>
                             <span about="sosa:Platform" rel="rdfs:subClassOf" resource="[_:SOSAPlatform1]"></span>
@@ -2538,4 +2538,4 @@ <h6><a href="#SOSAhasMember">sosa:hasMember</a></h6>
 
     </section>
 </section>
-<!--  </section>  -->
\ No newline at end of file
+<!--  </section>  -->
diff --git a/ssn/rdf/ontology/core/ssn-common.ttl b/ssn/rdf/ontology/core/ssn-common.ttl
index 0ee86b45..9d0ccab1 100644
--- a/ssn/rdf/ontology/core/ssn-common.ttl
+++ b/ssn/rdf/ontology/core/ssn-common.ttl
@@ -134,7 +134,7 @@ sosa:hasSimpleResult
 
 sosa:System 
   rdfs:subClassOf [ a owl:Restriction ; owl:onProperty sosa:hasSystemKind ; owl:allValuesFrom sosa:SystemKind ]  ;
-  rdfs:subClassOf [ a owl:Restriction ; owl:onProperty sosa:hasSystemKind ; owl:maxCardinality "1"^^xsd:nonNegativeInteger ] ;
+  rdfs:subClassOf [ a owl:Restriction ; owl:onProperty sosa:hasSystemKind ; owl:minCardinality "1"^^xsd:nonNegativeInteger ] ;
   rdfs:subClassOf [ a owl:Restriction ; owl:onProperty sosa:isHostedBy ; owl:allValuesFrom sosa:Platform ]  ;
   rdfs:subClassOf [ a owl:Restriction ; owl:onProperty sosa:implements ; owl:allValuesFrom sosa:Procedure ] ;
   rdfs:subClassOf [ a owl:Restriction ; owl:onProperty sosa:hasSubSystem ; owl:allValuesFrom sosa:System ]  ;
@@ -187,7 +187,7 @@ sosa:inDeployment
 
 sosa:Platform 
   rdfs:subClassOf [ a owl:Restriction ; owl:onProperty sosa:hasSystemKind ; owl:allValuesFrom sosa:PlatformKind ]  ;
-  rdfs:subClassOf [ a owl:Restriction ; owl:onProperty sosa:hasSystemKind ; owl:maxCardinality "1"^^xsd:nonNegativeInteger ] ;
+  rdfs:subClassOf [ a owl:Restriction ; owl:onProperty sosa:hasSystemKind ; owl:minCardinality "1"^^xsd:nonNegativeInteger ] ;
   rdfs:subClassOf [ a owl:Restriction ; owl:onProperty sosa:hosts ; owl:allValuesFrom sosa:System ]  ;
   rdfs:isDefinedBy sosa-common: .