Adrian/Ales, I've had a look at http://www.jboss.com/index.html?module=bb&op=viewtopic&t=130122, but it is not clear to me what the difference is between ModuleRequirement and PackageRequirement? Does a module represent a jar, thus meaning import everything from that jar? And is package more fine-grained, meaning only import these packages from that jar? Whatever the answer, I suppose the Module/Package difference would also apply to the capabilities? Also, what is UsesPackageRequirement? View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4195156#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...