diff --git a/org.fortiss.tooling.base.ui/trunk/schema/annotationViewPart.exsd b/org.fortiss.tooling.base.ui/trunk/schema/annotationViewPart.exsd
index 32c9efea763503b080d3702fd441d8e9e388f015..6f8d4fa9c92326c61791617d12a4b353bf827faf 100644
--- a/org.fortiss.tooling.base.ui/trunk/schema/annotationViewPart.exsd
+++ b/org.fortiss.tooling.base.ui/trunk/schema/annotationViewPart.exsd
@@ -51,7 +51,7 @@
 
    <element name="annotationViewPart">
       <complexType>
-         <sequence>
+         <sequence minOccurs="1" maxOccurs="unbounded">
             <element ref="modelElementClass"/>
          </sequence>
          <attribute name="binding" type="string" use="required">