public function formatGroup(Model\Group $model)
{
$entries = '';
foreach ($model->getResources() as $resource) {
$entries .= '<resource>' . $this->formatValue($resource) . '</resource>';
}
return <<<GROUP
<?xml version="1.0" encoding="UTF-8"?>
<imbo>
<name>{$model->getName()}</name>
<resources>{$entries}</resources>
</imbo>
GROUP;
}