MasterDefRegistry mdr;
Set<DefDescriptor<?>> loaded = Sets.newHashSet();
Set<DefDescriptor<?>> prev = Sets.newHashSet();
Set<DefDescriptor<?>> remove = null;
contextService.assertEstablished();
context = contextService.getCurrentContext();
mdr = context.getDefRegistry();
if (context.getPreloadedDefinitions() == null) {
//
// TODO (optimize): we could reverse this set randomly to try