public static function newTagInstance($sTagName, $sModelName, $iTaggedItemId)
{
$sTagName = StringUtil::normalize($sTagName);
$oTag = TagPeer::retrieveByName($sTagName);
if ($oTag === null) {
$oTag = new Tag();
$oTag->setName($sTagName);
$oTag->save();
}
$oTagInstance = self::retrieveByPK($oTag->getId(), $iTaggedItemId, $sModelName);
if ($oTagInstance !== null) {
throw new Exception("Instance of this tag does already exist");
}
$oTagInstance = new TagInstance();
$oTagInstance->setTag($oTag);
$oTagInstance->setModelName($sModelName);
$oTagInstance->setTaggedItemId($iTaggedItemId);
$oTagInstance->save();
return $oTagInstance;
}