Model:
	greetings+=Greeting*;
	
Greeting:
	'Hello' name=Name '!';
	
Name hidden(): ID (WS ID)* ;	

public class MyDslProposalProvider extends AbstractMyDslProposalProvider {
	
	....
	
	@Override
	public void completeGreeting_Name(EObject model, Assignment assignment,
			ContentAssistContext context, ICompletionProposalAcceptor acceptor) {
		for (String writer : writers) {
			acceptor.accept(createCompletionProposal(writer, context));
		}
	}

}