ObservableListTreeContentProvider cp = new ObservableListTreeContentProvider(
		new TreeFactoryImpl(), new TreeStructureAdvisorImpl());
	viewer.setContentProvider(cp);

	IObservableSet set = cp.getKnownElements();

	IObservableMap[] map = new IObservableMap[3];
	map[0] = EMFProperties.value(
		ModelPackage.Literals.HIERARCHY__NAME).observeDetail(set);		
	map[1] = EMFProperties.value(
		ModelPackage.Literals.HIERARCHY__CHILD).observeDetail(set);		
	map[2] = EMFProperties.value(FeaturePath.fromList(
		ModelPackage.Literals.HIERARCHY__CHILD, ModelPackage.Literals.HIERARCHY_NODE__NAME)).observeDetail(set);
		
	viewer.setLabelProvider(new TreeLabelProviderImpl(map));

	IEMFListProperty container = EMFProperties.multiList(
		FeaturePath.fromList(
				GroupsPackage.Literals.CONTAINER__FIRST_HIERARCHY, GroupsPackage.Literals.HIERARCHY__CHILD),
		FeaturePath.fromList(
				GroupsPackage.Literals.CONTAINER__SECOND_HIERARCHY, GroupsPackage.Literals.HIERARCHY__CHILD)
	);
	viewer.setInput(metadata.observe(gmd));

private static class TreeFactoryImpl implements IObservableFactory {

	private IEMFListProperty multi = EMFProperties.list(
		GroupsPackage.Literals.HIERARCHY__CHILD
	);
	    
	public IObservable createObservable(final Object target) {
		if (target instanceof IObservableList) {
			return (IObservable) target;
		} else if (target instanceof Node) {
			return multi.observe(target);
		}
		return null;
	}

}

private static class TreeStructureAdvisorImpl extends TreeStructureAdvisor {
		
	@Override
	public Object getParent(Object element) {
		if (element instanceof Node) {
			return ((Node) element).getParent();
		}
		return null;
	}

	@Override
	public Boolean hasChildren(Object element) {
		if (element instanceof Node && ((Node)element).getChild().size() > 0) {
			return Boolean.TRUE;
		}
		return super.hasChildren(element);
	}
}