$Name: This is the title - 1 2 123 - and it may contain special characters, e.g. öüäß
+Description:
"This description may span across
  multiple
        lines."
$end

+Value one: ( "String1" "String2" "etc." )

+Flag: 1

Model:
	myname=MyName
	description=Description
	valueone=ValueOne
	myflag=MyFlag

MynName:
	"$Name: " value=IDNG;

IDNG:
	ID(WS(ID|INT|'-'))*
;

Description:
	"+Description:"
	STRING
	"$end";

ValueOne:
	"+Value one: ( "STRING*" )";

MyFlag:
	"+Flag: "INT;

Model:
	myname=MyName
	description=Description
	valueone=ValueOne
	myflag=MyFlag;

terminal MyName:
	"$Name:" -> "\n";


Description:
	"+Description:"
	value=STRING
	"$end";

ValueOne:
	{ValueOne} "+Value" "one:" "(" values+=STRING* ")";

MyFlag hidden():
	"+Flag:" WS value=INT;

public class MyDslProposalProvider extends AbstractMyDslProposalProvider {
	
	@Override
	public void complete_MyName(EObject model, RuleCall ruleCall,
			ContentAssistContext context, ICompletionProposalAcceptor acceptor) {
		acceptor.accept(createCompletionProposal("$Name: Das ist der Titel\n", context));
	}

}

public class MyDslLabelProvider extends DefaultEObjectLabelProvider {

	@Inject
	public MyDslLabelProvider(AdapterFactoryLabelProvider delegate) {
		super(delegate);
	}
	
	String text(Description d) {
		return "Description: " + d.getValue();
	}
	
	String text(ValueOne vo) {
		return "ValueOne: " + vo.getValues();
	}
	
	String text(MyFlag mf) {
		return "MyFlag: " + mf.getValue();
	}

}

acceptor.accept(createCompletionProposal("$Name: Das ist der Titel\n", context));

terminal MyName:
	"$Name:" -> "\n";