There should be open ended versions of CompositeMetaType/CompositeValue, but currently it looks a little cumbersome. You would have to use a MutableCompositeMetaType implementation of CompositeMetaType, and use MutableCompositeMetaType.addItem(String itemName, String itemDescription, MetaType itemType) before calling CompositeValueSupport.set(String key, MetaValue value). This should really be internalized in the CompositeValueSupport.set method for MutableCompositeMetaTypes I believe. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4126789#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...