The class used to represent the entity type.
It must implement \Drupal\Core\Entity\EntityTypeInterface.
Type: string
Overrides EntityType::$entity_type_class
public $entity_type_class = 'Drupal\Core\Entity\ContentEntityType';
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https://api.drupal.org/api/drupal/core!lib!Drupal!Core!Entity!Annotation!ContentEntityType.php/property/ContentEntityType::entity_type_class/8.1.x