@Override public void completeMessageLink_Target(EObject model, Assignment assignment, ContentAssistContext context,
ICompletionProposalAcceptor acceptor) {
Collection<IEObjectDescription> scope = emptySet();
if (model instanceof Rpc) {
Rpc rpc = (Rpc) model;
scope = scopeProvider().potentialMessagesFor(rpc);
}
if (model instanceof Stream) {
Stream stream = (Stream) model;
scope = scopeProvider().potentialMessagesFor(stream);