diff --git a/OMDSServiceDefinition/src/main/resources/def/r1_4_0/omds3ServiceTypes.xsd b/OMDSServiceDefinition/src/main/resources/def/r1_4_0/omds3ServiceTypes.xsd
index f8f2bc66..0012ef7e 100644
--- a/OMDSServiceDefinition/src/main/resources/def/r1_4_0/omds3ServiceTypes.xsd
+++ b/OMDSServiceDefinition/src/main/resources/def/r1_4_0/omds3ServiceTypes.xsd
@@ -422,7 +422,7 @@
 					<xsd:documentation>Meta-Informationen zum Dokument</xsd:documentation>
 				</xsd:annotation>
 			</xsd:element>
-			<xsd:element name="arcImage" type="xsd:base64Binary" xmime:expectedContentTypes="image/jpeg" xmlns:xmime="http://www.w3.org/2005/05/xmlmime">
+			<xsd:element name="arcImage" type="xsd:base64Binary" xmime:expectedContentTypes="application/octet-stream" xmlns:xmime="http://www.w3.org/2005/05/xmlmime">
 				<xsd:annotation>
 					<xsd:documentation>Das eigentliche Dokument als base64-Binary</xsd:documentation>
 				</xsd:annotation>