HHH-7450 fix test failure

Author: stliu

hibernate-core/src/main/java/org/hibernate/metamodel/internal/source/hbm/RootEntitySourceImpl.java

@@ -141,15 +141,14 @@ else if ( entityElement().getTimestamp() != null ) {
 	protected List<AttributeSource> buildAttributeSources(List<AttributeSource> attributeSources) {
 		final JaxbNaturalIdElement naturalId = entityElement().getNaturalId();
 		if ( naturalId != null ) {
-			return buildAttributeSources(
-					entityElement(), attributeSources, null, naturalId.isMutable()
-					? SingularAttributeBinding.NaturalIdMutability.MUTABLE
-					: SingularAttributeBinding.NaturalIdMutability.IMMUTABLE
-			);
-		}
-		else {
-			return super.buildAttributeSources( attributeSources );
-		}
+			final SingularAttributeBinding.NaturalIdMutability naturalIdMutability = naturalId.isMutable() ? SingularAttributeBinding.NaturalIdMutability.MUTABLE : SingularAttributeBinding.NaturalIdMutability.IMMUTABLE;
+			processPropertyAttributes( attributeSources, naturalId.getProperty(), null, naturalIdMutability );
+			processManyToOneAttributes( attributeSources, naturalId.getManyToOne(), null, naturalIdMutability );
+			processComponentAttributes( attributeSources, naturalId.getComponent(), null, naturalIdMutability );
+			processDynamicComponentAttributes( attributeSources, naturalId.getDynamicComponent(), null, naturalIdMutability );
+			processAnyAttributes( attributeSources, naturalId.getAny(), null, naturalIdMutability );
+		}
+		return super.buildAttributeSources( attributeSources );
 	}
 
 	@Override

hibernate-core/src/main/resources/org/hibernate/hibernate-mapping-4.0.xsd

@@ -321,6 +321,11 @@ arbitrary number of queries, and import declarations of arbitrary classes.
     <xs:complexType name="natural-id-element">
         <xs:sequence>
             <xs:choice minOccurs="0" maxOccurs="unbounded">
+                <xs:annotation>
+                    <xs:appinfo>
+                        <simplify:as-element-property/>
+                    </xs:appinfo>
+                </xs:annotation>
                 <xs:element name="property" type="property-element"/>
                 <xs:element name="many-to-one" type="many-to-one-element"/>
                 <xs:element name="component" type="component-element"/>