$def with (form, model, item=None)

$var title: titulo
$var hierarchy = []
$var tab: users
$var css = ['admin.css']

    <form method="POST" action="">
        <fieldset>
            <legend>$model - $(item.id if item else _('Add'))</legend>
            $:form.render()
        </fieldset>
        <input type="submit"/>
    </form>