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diff --git a/web/core/lib/Drupal/Core/TypedData/DataDefinitionInterface.php b/web/core/lib/Drupal/Core/TypedData/DataDefinitionInterface.php
index 64d779c31..d12ccfdef 100644
--- a/web/core/lib/Drupal/Core/TypedData/DataDefinitionInterface.php
+++ b/web/core/lib/Drupal/Core/TypedData/DataDefinitionInterface.php
@@ -218,4 +218,15 @@ interface DataDefinitionInterface {
    */
   public function addConstraint($constraint_name, $options = NULL);
 
+  /**
+   * Determines whether the data value is internal.
+   *
+   * This can be used in a scenario when it is not desirable to expose this data
+   * value to an external system.
+   *
+   * @return bool
+   *   Whether the data value is internal.
+   */
+  public function isInternal();
+
 }