Ok, thanks. There also are some helper classes/methods regarding resolvers: SchemaResolverConfig and SingletonSchemaResolverFactory. Maybe there will be something useful for you. I've committed MutableSchemaResolver to XB trunk. Issue https://jira.jboss.org/jira/browse/JBXB-190 In the interface for mapping methods instead of "add" prefix I used "map", since in case of one-to-many mapping (e.g. uri-to-classes) "add" seems to be more ambiguous for methods that override previous mapping instead of actually adding. View the original post : http://www.jboss.org/index.html?module=bb&op=viewtopic&p=4215634#... Reply to the post : http://www.jboss.org/index.html?module=bb&op=posting&mode=reply&a...