protected function visitLimitation(Generator $generator, Limitation $limitation)
{
$generator->startHashElement('limitation');
$generator->startAttribute('identifier', $limitation->getIdentifier());
$generator->endAttribute('identifier');
$generator->startHashElement('values');
$generator->startList('ref');
foreach ($limitation->limitationValues as $limitationValue) {
$generator->startObjectElement('ref');
$generator->startAttribute('href', $limitationValue);
$generator->endAttribute('href');
$generator->endObjectElement('ref');
}
$generator->endList('ref');
$generator->endHashElement('values');
$generator->endHashElement('limitation');
}