Alex, I'm now using the SchemaBinding as you suggested: SchemaBinding binding = JBossXBBuilder.build(AbstractKernelDeployment.class); | marshaller.marshal(binding, null, deployment, writer); It still looks like I'm missing something: Exception in thread "main" org.jboss.xb.binding.JBossXBRuntimeException: Failed to marshal wildcard: neither class mapping was found for class org.jboss.kernel.plugins.deployment.AbstractKernelDeployment@19267322 (toString: AbstractKernelDeployment@125fefa{name=null installed=false beanFactories=[AbstractBeanMetaData@186df0f{name=test bean=org.jboss.microcontainer.tools.Test properties= constructor=null autowireCandidate=true}]}) nor marshaller for unresolved classes was setup. | at org.jboss.xb.binding.sunday.marshalling.MarshallerImpl.marshalWildcard(MarshallerImpl.java:833) | at org.jboss.xb.binding.sunday.marshalling.MarshallerImpl.marshalWildcardOccurence(MarshallerImpl.java:792) | at org.jboss.xb.binding.sunday.marshalling.MarshallerImpl.marshalParticle(MarshallerImpl.java:745) | at org.jboss.xb.binding.sunday.marshalling.MarshallerImpl.marshalModelGroupSequence(MarshallerImpl.java:970) | at org.jboss.xb.binding.sunday.marshalling.MarshallerImpl.marshalModelGroup(MarshallerImpl.java:910) | at org.jboss.xb.binding.sunday.marshalling.MarshallerImpl.marshalParticle(MarshallerImpl.java:656) | at org.jboss.xb.binding.sunday.marshalling.MarshallerImpl.marshalModelGroupSequence(MarshallerImpl.java:970) | at org.jboss.xb.binding.sunday.marshalling.MarshallerImpl.marshalModelGroup(MarshallerImpl.java:910) | at org.jboss.xb.binding.sunday.marshalling.MarshallerImpl.marshalParticle(MarshallerImpl.java:656) | at org.jboss.xb.binding.sunday.marshalling.MarshallerImpl.marshalComplexType(MarshallerImpl.java:619) | at org.jboss.xb.binding.sunday.marshalling.MarshallerImpl.marshalElementType(MarshallerImpl.java:430) | at org.jboss.xb.binding.sunday.marshalling.MarshallerImpl.marshalElement(MarshallerImpl.java:329) | at org.jboss.xb.binding.sunday.marshalling.MarshallerImpl.marshalElementOccurence(MarshallerImpl.java:309) | at org.jboss.xb.binding.sunday.marshalling.MarshallerImpl.marshallInternal(MarshallerImpl.java:215) | at org.jboss.xb.binding.sunday.marshalling.MarshallerImpl.marshal(MarshallerImpl.java:157) | at org.jboss.microcontainer.tools.Test.main(Test.java:79) | Any thoughts? View the original post : http://www.jboss.org/index.html?module=bb&op=viewtopic&p=4234186#... Reply to the post : http://www.jboss.org/index.html?module=bb&op=posting&mode=reply&a...