Expanded class hierarchy of YamlFormHandlerInterface in YAML Form 8

interface \Drupal\Component\Plugin\PluginInspectionInterface; interface \Drupal\Component\Plugin\ConfigurablePluginInterface; interface \Drupal\Core\Plugin\ContainerFactoryPluginInterface; interface \Drupal\Core\Plugin\PluginFormInterface
- interface \Drupal\yamlform\YamlFormHandlerInterface
  - interface \Drupal\yamlform\YamlFormHandlerMessageInterface

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