SAXParseException configuring event listeners in spring

Part of my spring configuration:

<drools:ksession id="statefulSession" type="stateful" kbase="kbase1">
<drools:workingMemoryEventListener>
<bean class="org.drools.event.DebugWorkingMemoryEventListener"/>
</drools:workingMemoryEventListener>
<drools:processEventListener>
<bean class="org.drools.event.DebugProcessEventListener"/>
</drools:processEventListener>
</drools:ksession>

throws :

Caused by: org.xml.sax.SAXParseException; lineNumber: 15; columnNumber: 41;
cvc-complex-type.2.4.a: Invalid content was found starting with element
'drools:processEventListener'. One of
'

{"http://drools.org/schema/drools-spring":workingMemoryEventListener, "http://drools.org/schema/drools-spring":batch, "http://drools.org/schema/drools-spring":script, "http://drools.org/schema/drools-spring":configuration}

' is expected.
at
com.sun.org.apache.xerces.internal.util.ErrorHandlerWrapper.createSAXParseException(ErrorHandlerWrapper.java:198)
at
com.sun.org.apache.xerces.internal.util.ErrorHandlerWrapper.error(ErrorHandlerWrapper.java:134)
at
com.sun.org.apache.xerces.internal.impl.XMLErrorReporter.reportError(XMLErrorReporter.java:387)
at
com.sun.org.apache.xerces.internal.impl.XMLErrorReporter.reportError(XMLErrorReporter.java:321)
at
com.sun.org.apache.xerces.internal.impl.xs.XMLSchemaValidator$XSIErrorReporter.reportError(XMLSchemaValidator.java:421)
at
com.sun.org.apache.xerces.internal.impl.xs.XMLSchemaValidator.reportSchemaError(XMLSchemaValidator.java:3186)
at
com.sun.org.apache.xerces.internal.impl.xs.XMLSchemaValidator.handleStartElement(XMLSchemaValidator.java:1810)
at
com.sun.org.apache.xerces.internal.impl.xs.XMLSchemaValidator.startElement(XMLSchemaValidator.java:709)
at
com.sun.org.apache.xerces.internal.impl.XMLNSDocumentScannerImpl.scanStartElement(XMLNSDocumentScannerImpl.java:376)
at
com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl$FragmentContentDriver.next(XMLDocumentFragmentScannerImpl.java:2732)
at
com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl.next(XMLDocumentScannerImpl.java:625)
at
com.sun.org.apache.xerces.internal.impl.XMLNSDocumentScannerImpl.next(XMLNSDocumentScannerImpl.java:116)
at
com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanDocument(XMLDocumentFragmentScannerImpl.java:488)
at
com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:819)
at
com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:748)
at
com.sun.org.apache.xerces.internal.parsers.XMLParser.parse(XMLParser.java:123)
at
com.sun.org.apache.xerces.internal.parsers.DOMParser.parse(DOMParser.java:239)
at
com.sun.org.apache.xerces.internal.jaxp.DocumentBuilderImpl.parse(DocumentBuilderImpl.java:288)
at
org.springframework.beans.factory.xml.DefaultDocumentLoader.loadDocument(DefaultDocumentLoader.java:75)
at
org.springframework.beans.factory.xml.XmlBeanDefinitionReader.doLoadBeanDefinitions(XmlBeanDefinitionReader.java:388)

But following configuration is OK:

<drools:ksession id="statefulSession" type="stateful" kbase="kbase1">
<drools:processEventListener>
<bean class="org.drools.event.DebugProcessEventListener"/>
</drools:processEventListener>
</drools:ksession>

Also this configuration is OK:

<drools:ksession id="statefulSession" type="stateful" kbase="kbase1">
<drools:workingMemoryEventListener>
<bean class="org.drools.event.DebugWorkingMemoryEventListener"/>
</drools:workingMemoryEventListener>
</drools:ksession>

Exception occurs only when both listeners are configured.

probably because of bad position of elements; when listeners configured inside
<drools:ksession> as shown above, current order required:
agendaEventListener
processEventListener
workingMemoryEventListener

but when configured through <drools:eventListeners> element and listeners
attribute in <drools:ksession> element, order of event listeners does not
matter. I think this is because of <xsd:all> resp. <xsd:sequence> inside
drools-spring.xsd.

It would by nice to unite both styles of configuration.