public function addUser(AbstractUnitObject $unit)
{
if ($this->getRootNode()->queryOne(sprintf('phpdox:users/phpdox:%s[@full = "%s"]', $unit->getType(), $unit->getName())) !== NULL) {
return;
}
$user = $this->addToContainer('users', $unit->getType());
$this->setName($unit->getName(), $user);
}