diff --git a/public/instance/schema/diglib-dmd.rnc b/public/instance/schema/diglib-dmd.rnc
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+# Deskriptive Metadaten
+#
+# Autor: David Maus <maus@hab.de>
+# Timestamp: <2019-01-16 12:22:36 maus>
+#
+
+namespace rdf = "http://www.w3.org/1999/02/22-rdf-syntax-ns#"
+
+include "shared-dc.rnc"
+
+start =
+   element rdf:Description {
+      requiredMetadata
+    & optionalMetadata
+   }
+
+requiredMetadata =
+   property.identifier+
+
+optionalMetadata = empty
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