public TypedDataInterface::getParent()
Returns the parent data structure; i.e. either complex data or a list.
\Drupal\Core\TypedData\TraversableTypedDataInterface|null The parent data structure, either complex data or a list; or NULL if this is the root of the typed data tree.
public function getParent();
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https://api.drupal.org/api/drupal/core!lib!Drupal!Core!TypedData!TypedDataInterface.php/function/TypedDataInterface::getParent/8.1.x