Persons:
	"Persons" ":" firstPerson=Person ("," furtherPersons+=Person)* '.'
;

Person hidden(WS):
	firstName=ID (lastNames+=ID)*
;

PersonString returns ecore::EString:
	ID (ID)*
;
	
	
Line:
    person=[Person|PersonString] struff=Stuff 
;

Stuff:
	"..."
;

package org.xtext.example.mydsl;

import org.apache.commons.lang.StringUtils;
import org.eclipse.xtext.naming.DefaultDeclarativeQualifiedNameProvider;
import org.eclipse.xtext.naming.QualifiedName;
import org.xtext.example.mydsl.myDsl.Person;

public class MyQNP extends DefaultDeclarativeQualifiedNameProvider {
	
	QualifiedName qualifiedName(Person p) {
		return QualifiedName.create(p.getFirstName() + " " +  StringUtils.join(p.getLastNames(), " "));
	}

}

public class MyDslRuntimeModule extends org.xtext.example.mydsl.AbstractMyDslRuntimeModule {

	@Override
	public Class<? extends IQualifiedNameProvider> bindIQualifiedNameProvider() {
		return MyQNP.class;
	}