All classes that implement PluginDefinitionInterface in Zircon Profile 8
- class \Drupal\Core\Config\Entity\ConfigEntityType implements ConfigEntityTypeInterface
- class \Drupal\Core\Entity\ContentEntityType implements ContentEntityTypeInterface
- class \Drupal\Core\Entity\EntityType implements EntityTypeInterface uses StringTranslationTrait
- class \Drupal\Tests\views\Unit\TestEntityType