Model: AbstractObject | InstanzObject;

AbstractObject: 'AbstractObject' name=ID
  '{'
    (propertyDecls+=PropertyDecl)*
  '}';

InstanzObject : 'InstanzObject' name=ID 'implements' base=[AbstractObject]
  '{'
    (propertyDefs+=PropertyDefs)*
  '}';

PropertyDecl: type=TYPE name=ID;
PropertyDef: name=[PropertyDecl]  ':=' value=VALUE;

AbstractObject BaseObject
{
  int PropertyA
  string PropertyB
}

InstanzObject Object1 implements BaseObject
{
  PropertyA := 5
  PropertyB := "Hello World"
}

InstanzObject Object1 implements BaseObject

{
  PropertyA := <int>
  PropertyB: = <string>
}

public void completeInstanzObject_base(EObject model, Assignment assignment, ContentAssistContext context, ICompletionProposalAcceptor acceptor) {
	super.completeInstanzObject_base(model, assignment, context, acceptor);
	InstanzObject instanz = (InstanzObject)context.getCurrentModel();
	AbstractObject abstract = instanz.getbase();
	EList<PropertyDecl> properties = abstract.getpropertyDefs();
		
	String dstr = abstract.getname() + " { [..] } - Instanz Template";
	String pstr = abstract.getname() + "\r\n";
	pstr += "{\r\n";
	for (PropertyDecl property: properties) {
		pstr += property.getname() + ":= <" + property.gettype() + ">\r\n";
	} 
	pstr += "}\r\n";

	ICompletionProposal proposal = createCompletionProposal(pstr, dstr, null, context);
	acceptor.accept(proposal);
}