/**
* {@inheritDoc}
*/
public function load(ObjectManager $manager)
{
$attribute = new Attribute();
$attribute->setName('content');
$attribute->setDisplayName('Content');
$attribute->setValueType('html');
$attribute->setSchema($this->getReference('page-template'));
$attribute->setSort(10);
$manager->persist($attribute);
$manager->flush();
}