/**
* Serializes the content object attribute
*
* @param eZPackage $package
* @param eZContentObjectAttribute $objectAttribute
* @return DOMNode
*/
function serializeContentObjectAttribute($package, $objectAttribute)
{
$node = $this->createContentObjectAttributeDOMNode($objectAttribute);
$eztags = new eZTags();
$eztags->createFromAttribute($objectAttribute);
$dom = $node->ownerDocument;
$idStringNode = $dom->createElement('id-string');
$idStringNode->appendChild($dom->createTextNode($eztags->idString()));
$node->appendChild($idStringNode);
$keywordStringNode = $dom->createElement('keyword-string');
$keywordStringNode->appendChild($dom->createTextNode($eztags->keywordString()));
$node->appendChild($keywordStringNode);
$parentStringNode = $dom->createElement('parent-string');
$parentStringNode->appendChild($dom->createTextNode($eztags->parentString()));
$node->appendChild($parentStringNode);
return $node;
}