There is a bug in the DefaultSchemaResolver that I am going to fix. But there is another issue you are going to run into after that. I.e. redefine can only be used with schemas with the same targetNamespace or with no targetNamespace. So, in your example you'll get an error like org.jboss.xb.binding.JBossXBRuntimeException: -1:-1 10:18 src-redefine.3.1: The targetNamespace of the referenced schema, currently 'urn:jboss:beans-common:2.0', must be identical to that of the redefining schema, currently 'urn:jboss:aop-beans:1.0'. | at org.jboss.xb.binding.sunday.unmarshalling.XsdBinderTerminatingErrorHandler.handleError(XsdBinderTerminatingErrorHandler.java:40) | at org.apache.xerces.impl.xs.XMLSchemaLoader.reportDOMFatalError(Unknown Source) | at org.apache.xerces.impl.xs.XSLoaderImpl.loadURI(Unknown Source) | at org.jboss.xb.binding.Util.loadSchema(Util.java:367) PS: I saw you also tried the namespace as the schemaLocation, it should be the filename. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4136295#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...