I don't have a model group here.

I got:

<?xml version="1.0"?>
<jboss
 xmlns="http://www.jboss.com/xml/ns/javaee"
 xmlns:jee="http://java.sun.com/xml/ns/javaee"
 xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 xsi:schemaLocation="http://www.jboss.com/xml/ns/javaee
 http://www.jboss.org/j2ee/schema/jboss_5_0.xsd"
 version="3.0">
 <enterprise-beans>
 <service>
 <ejb-name>ServiceSix</ejb-name>
 <ejb-class>org.jboss.ejb3.test.service.ServiceSix</ejb-class>
 <local>org.jboss.ejb3.test.service.ServiceSixLocal</local>
 <remote>org.jboss.ejb3.test.service.ServiceSixRemote</remote>
 <management>org.jboss.ejb3.test.service.ServiceSixManagement</management>
 <jndi-name>serviceSix/remote</jndi-name>
 <local-jndi-name>serviceSix/local</local-jndi-name>
 <ejb-ref>
 <ejb-ref-name>ejb/StatelessBean</ejb-ref-name>
 <ejb-ref-type>Session</ejb-ref-type>
 <remote>org.jboss.ejb3.test.service.StatelessRemote</remote>
 <ejb-link>StatelessBean</ejb-link>
 <injection-target>
 <injection-target-class>org.jboss.ejb3.test.service.ServiceSix</injection-target-class>
 <injection-target-name>stateless</injection-target-name>
 </injection-target>
 <jndi-name>StatelessBean/remote</jndi-name>
 </ejb-ref>
 <ejb-local-ref>
 <ejb-ref-name>ejb/StatelessLocal</ejb-ref-name>
 <ejb-ref-type>Session</ejb-ref-type>
 <local>org.jboss.ejb3.test.service.StatelessLocal</local>
 <ejb-link>StatelessBean</ejb-link>
 <injection-target>
 <injection-target-class>org.jboss.ejb3.test.service.ServiceSix</injection-target-class>
 <injection-target-name>setStatelessLocal</injection-target-name>
 </injection-target>
 <jndi-name>StatelessBean/local</jndi-name>
 </ejb-local-ref>
 <resource-ref>
 <res-ref-name>testDatasource</res-ref-name>
 <res-type>javax.sql.DataSource</res-type>
 <res-auth>Container</res-auth>
 <res-sharing-scope>Shareable</res-sharing-scope>
 <mapped-name>java:/DefaultDS</mapped-name>
 <injection-target>
 <injection-target-class>org.jboss.ejb3.test.service.ServiceSix</injection-target-class>
 <injection-target-name>testDatasource</injection-target-name>
 </injection-target>
 </resource-ref>
 <resource-env-ref>
 <jee:description>A test of the resource-env-ref tag</jee:description>
 <resource-env-ref-name>res/aQueue</resource-env-ref-name>
 <resource-env-ref-type>javax.jms.Queue</resource-env-ref-type>
 <jndi-name>queue/mdbtest</jndi-name>
 </resource-env-ref>
 </service>
 </enterprise-beans>
</jboss>

So this is a combined JBossSessionBeanMeta and SessionBeanMetaData rolled into 1. Since I'm part of JBossEnterpriseBeansMetaData I must extend JBossSessionBeanMetaData. So:

@XmlType(name="jboss-service-beanType")
public class JBossServiceBeanMetaData extends JBossSessionBeanMetaData
{
 public void setSessionBeanMetaData(SessionBeanMetaData embedded)
 {
 ...
 }
}

Now what annotations do I need to add?

Ah got something, now I see what you mean:

@JBossXmlModelGroup(name="embeddedSessionBean", propOrder={"descriptionGroup", "ejbClass" })
class EmbeddedSessionBeanMetaData extends SessionBeanMetaData
{
}

It would appear that name is mandatory and I must specify a propOrder to get things done.

The JBossSessionBeanMetaData class itself is going to be a dirty hack into existing structures.