diff --git a/acdh-schema.owl b/acdh-schema.owl
index 40c808f..74e5947 100644
--- a/acdh-schema.owl
+++ b/acdh-schema.owl
@@ -3123,6 +3123,12 @@ Die verschiedenen Rollen, die ein Agent in Bezug auf ein Projekt, eine Sammlung,
                 <owl:maxCardinality rdf:datatype="http://www.w3.org/2001/XMLSchema#nonNegativeInteger">1</owl:maxCardinality>
             </owl:Restriction>
         </rdfs:subClassOf>
+        <rdfs:subClassOf>
+            <owl:Restriction>
+                <owl:onProperty rdf:resource="https://vocabs.acdh.oeaw.ac.at/schema#hasPid"/>
+                <owl:maxCardinality rdf:datatype="http://www.w3.org/2001/XMLSchema#nonNegativeInteger">1</owl:maxCardinality>
+            </owl:Restriction>
+        </rdfs:subClassOf>
     </owl:Class>
     
 
@@ -3775,5 +3781,5 @@ Note that though a Project might (and usually will) use or produce data, it is N
 
 
 
-<!-- Generated by the OWL API (version 4.5.29.2024-05-13T12:11:03Z) https://github.com/owlcs/owlapi -->
+<!-- Generated by the OWL API (version 4.5.26.2023-07-17T20:34:13Z) https://github.com/owlcs/owlapi -->