"Gary Marsh" wrote : | Do I need to update an .xsd file somewhere? | There is no .xsd file. The schema is in-memory generated from metadata classes. e.g. see AbstractBeanMetaData from MC and JBossXB project My guess would be you're missing MC's classloading and aop-mc-int on the classpath, hence no matching metadata classes --> no schema --> unknown elements. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4200117#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...