Extenders allow you to attach extended information to an
ElggEntity. Core supports two: ElggAnnotation, ElggMetadata,
and ElggRelationship
Saving the extender data to database is handled by the child class.
protected function initializeAttributes()
{
parent::initializeAttributes();
$this->attributes['type'] = "metadata";
}
/**
* (non-PHPdoc)
*
* @see ElggData::initializeAttributes()
*
* @return void
*/
protected function initializeAttributes()
{
parent::initializeAttributes();
$this->attributes['type'] = 'annotation';
}