diff --git a/public/ontology/diglib-struct.rdf b/public/ontology/diglib-struct.rdf
index e287a3d1e31bfb3601b9134c7d3749a92712932d..53b75976d7b638dbe7f5feaed379db2a7973498a 100644
--- a/public/ontology/diglib-struct.rdf
+++ b/public/ontology/diglib-struct.rdf
@@ -10,16 +10,16 @@
     <rdfs:label xml:lang="de">Strukturdaten der Wolfenbütteler Digitalen Bibliothek</rdfs:label>
     <dct:publisher>
       <foaf:Organization rdf:about="http://uri.hab.de/instance/organization/habwf">
-        <rdfs:label>Herzog August Bibliothek Wolfenbüttel</rdfs:label>
+        <skos:prefLabel>Herzog August Bibliothek Wolfenbüttel</skos:prefLabel>
       </foaf:Organization>
     </dct:publisher>
     <dct:license>
       <dct:LicenseDocument>
         <owl:sameAs rdf:resource="http://creativecommons.org/publicdomain/zero/1.0/"/>
-        <rdfs:label>CC0 1.0 Universal</rdfs:label>
+        <skos:prefLabel>CC0 1.0 Universal</skos:prefLabel>
       </dct:LicenseDocument>
     </dct:license>
-    <dct:modified rdf:datatype="http://www.w3.org/2001/XMLSchema#date">2018-02-20</dct:modified>
+    <dct:modified rdf:datatype="http://www.w3.org/2001/XMLSchema#date">2018-03-01</dct:modified>
     <dct:created rdf:datatype="http://www.w3.org/2001/XMLSchema#date">2018-01-31</dct:created>
   </rdf:Description>
 
diff --git a/public/ontology/diglib-types.rdf b/public/ontology/diglib-types.rdf
index a1eddb0dc6cc42d45b4719cdc8175d884a1ada56..e061c47d13962689871fbab85f486e2ef2e77791 100644
--- a/public/ontology/diglib-types.rdf
+++ b/public/ontology/diglib-types.rdf
@@ -10,16 +10,16 @@
     <skos:prefLabel xml:lang="de">Datentypen der Wolfenbütteler Digitalen Bibliothek</skos:prefLabel>
     <dct:publisher>
       <foaf:Organization rdf:about="http://uri.hab.de/instance/organization/habwf">
-        <rdfs:label>Herzog August Bibliothek Wolfenbüttel</rdfs:label>
+        <skos:prefLabel>Herzog August Bibliothek Wolfenbüttel</skos:prefLabel>
       </foaf:Organization>
     </dct:publisher>
     <dct:license>
       <dct:LicenseDocument>
         <owl:sameAs rdf:resource="http://creativecommons.org/publicdomain/zero/1.0/"/>
-        <rdfs:label>CC0 1.0 Universal</rdfs:label>
+        <skos:prefLabel>CC0 1.0 Universal</skos:prefLabel>
       </dct:LicenseDocument>
     </dct:license>
-    <dct:modified rdf:datatype="http://www.w3.org/2001/XMLSchema#date">2018-02-20</dct:modified>
+    <dct:modified rdf:datatype="http://www.w3.org/2001/XMLSchema#date">2018-03-01</dct:modified>
     <dct:created rdf:datatype="http://www.w3.org/2001/XMLSchema#date">2017-06-23</dct:created>
   </rdf:Description>