Objective format: trees and ArrayObject

>>>>templates/test.tpl
<opt:tree name="tree">
<opt:list>
LIST START:
<opt:content />
LIST END:
</opt:list>
<opt:node>
NODE {$tree.item} START:
<opt:content />
NODE {$tree.item} END
</opt:node>
</opt:tree>

>>>>data.php

$obj1 = new stdClass;
$obj1->item = 'FOO';
$obj1->depth = 0;
$obj2 = new stdClass;
$obj2->item = 'BAR';
$obj2->depth = 1;
$obj3 = new stdClass;
$obj3->item = 'JOE';
$obj3->depth = 1;

$view->tree = new ArrayObject(array(0 =>
	$obj1, $obj2, $obj3

));
$view->setFormat('tree', 'Objective');

>>>>expected.txt
OUTPUT

>>>>result.txt
LIST START:
NODE FOO START:
LIST START:
NODE BAR START:
NODE BAR END
NODE JOE START:
NODE JOE END
LIST END:
NODE FOO END
LIST END: