@Override
    public DataNode readNode(ResourceId path, Filter filter) {
        // FIXME transform filter? is it possible?
        return super.readNode(toAbsoluteId(path), filter);
    }
@Test
    public void testReadNode() {
        Filter filter = null;
        DataNode returned = view.readNode(relIntf, filter);

        assertTrue(ResourceIds.isPrefix(rid, realPath));

        // FIXME test realFilter

        // TODO do we expect something to happen on returned?
    }