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diff --git a/web/core/modules/link/src/LinkItemInterface.php b/web/core/modules/link/src/LinkItemInterface.php
new file mode 100644
index 000000000..530617044
--- /dev/null
+++ b/web/core/modules/link/src/LinkItemInterface.php
@@ -0,0 +1,43 @@
+<?php
+
+namespace Drupal\link;
+
+use Drupal\Core\Field\FieldItemInterface;
+
+/**
+ * Defines an interface for the link field item.
+ */
+interface LinkItemInterface extends FieldItemInterface {
+
+  /**
+   * Specifies whether the field supports only internal URLs.
+   */
+  const LINK_INTERNAL = 0x01;
+
+  /**
+   * Specifies whether the field supports only external URLs.
+   */
+  const LINK_EXTERNAL = 0x10;
+
+  /**
+   * Specifies whether the field supports both internal and external URLs.
+   */
+  const LINK_GENERIC = 0x11;
+
+  /**
+   * Determines if a link is external.
+   *
+   * @return bool
+   *   TRUE if the link is external, FALSE otherwise.
+   */
+  public function isExternal();
+
+  /**
+   * Gets the URL object.
+   *
+   * @return \Drupal\Core\Url
+   *   Returns a Url object.
+   */
+  public function getUrl();
+
+}