The definition class to use for defining data of this type. Must implement the \Drupal\Core\TypedData\DataDefinitionInterface.
Type: string
public $definition_class = '\Drupal\Core\TypedData\DataDefinition';
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https://api.drupal.org/api/drupal/core!lib!Drupal!Core!TypedData!Annotation!DataType.php/property/DataType::definition_class/8.1.x