diff --git a/data/ontologies/digital-heraldry-ontology.ttl b/data/ontologies/digital-heraldry-ontology.ttl
index ffda7b49baaafcebebdd88bd517f3550fb13f8f4..8d9b59b98930e079ec84ef687470312026a793da 100644
--- a/data/ontologies/digital-heraldry-ontology.ttl
+++ b/data/ontologies/digital-heraldry-ontology.ttl
@@ -1572,32 +1572,32 @@ dhoh:Layer rdf:type owl:Class ;
                                ] ,
                                [ rdf:type owl:Restriction ;
                                  owl:onProperty dhoh:hasCharge1 ;
-                                 owl:maxQualifiedCardinality "1"^^xsd:nonNegativeInteger ;
+                                 owl:minQualifiedCardinality "1"^^xsd:nonNegativeInteger ;
                                  owl:onClass dhoh:Charge
                                ] ,
                                [ rdf:type owl:Restriction ;
                                  owl:onProperty dhoh:hasCharge2 ;
-                                 owl:maxQualifiedCardinality "1"^^xsd:nonNegativeInteger ;
+                                 owl:minQualifiedCardinality "1"^^xsd:nonNegativeInteger ;
                                  owl:onClass dhoh:Charge
                                ] ,
                                [ rdf:type owl:Restriction ;
                                  owl:onProperty dhoh:hasCharge3 ;
-                                 owl:maxQualifiedCardinality "1"^^xsd:nonNegativeInteger ;
+                                 owl:minQualifiedCardinality "1"^^xsd:nonNegativeInteger ;
                                  owl:onClass dhoh:Charge
                                ] ,
                                [ rdf:type owl:Restriction ;
                                  owl:onProperty dhoh:hasCharge4 ;
-                                 owl:maxQualifiedCardinality "1"^^xsd:nonNegativeInteger ;
+                                 owl:minQualifiedCardinality "1"^^xsd:nonNegativeInteger ;
                                  owl:onClass dhoh:Charge
                                ] ,
                                [ rdf:type owl:Restriction ;
                                  owl:onProperty dhoh:hasCharge5 ;
-                                 owl:maxQualifiedCardinality "1"^^xsd:nonNegativeInteger ;
+                                 owl:minQualifiedCardinality "1"^^xsd:nonNegativeInteger ;
                                  owl:onClass dhoh:Charge
                                ] ,
                                [ rdf:type owl:Restriction ;
                                  owl:onProperty dhoh:hasCharge6 ;
-                                 owl:maxQualifiedCardinality "1"^^xsd:nonNegativeInteger ;
+                                 owl:minQualifiedCardinality "1"^^xsd:nonNegativeInteger ;
                                  owl:onClass dhoh:Charge
                                ] ;
            rdfs:comment "A group of one or more Charges that form a strong visual relation between each other. A Layer may be connected to other Layers by using hasVisualRelation."@en ;