diff --git a/hibernate-core/src/main/resources/org/hibernate/hibernate-mapping-4.0.xsd b/hibernate-core/src/main/resources/org/hibernate/hibernate-mapping-4.0.xsd
index 5603d91c55..6fb18f23e2 100644
--- a/hibernate-core/src/main/resources/org/hibernate/hibernate-mapping-4.0.xsd
+++ b/hibernate-core/src/main/resources/org/hibernate/hibernate-mapping-4.0.xsd
@@ -344,6 +344,11 @@ arbitrary number of queries, and import declarations of arbitrary classes.
         <xs:sequence>
             <xs:element name="meta" minOccurs="0" maxOccurs="unbounded" type="meta-element"/>
             <xs:choice maxOccurs="unbounded">
+                <xs:annotation>
+                    <xs:appinfo>
+                        <simplify:as-element-property/>
+                    </xs:appinfo>
+                </xs:annotation>
                 <xs:element name="key-property" type="key-property-element"/>
                 <xs:element name="key-many-to-one" type="key-many-to-one-element"/>
             </xs:choice>