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diff --git a/web/core/modules/layout_builder/src/SectionStorage/SectionStorageManagerInterface.php b/web/core/modules/layout_builder/src/SectionStorage/SectionStorageManagerInterface.php
new file mode 100644
index 000000000..3b269fcbb
--- /dev/null
+++ b/web/core/modules/layout_builder/src/SectionStorage/SectionStorageManagerInterface.php
@@ -0,0 +1,65 @@
+<?php
+
+namespace Drupal\layout_builder\SectionStorage;
+
+use Drupal\Component\Plugin\Discovery\DiscoveryInterface;
+
+/**
+ * Provides the interface for a plugin manager of section storage types.
+ *
+ * @internal
+ *   Layout Builder is currently experimental and should only be leveraged by
+ *   experimental modules and development releases of contributed modules.
+ *   See https://www.drupal.org/core/experimental for more information.
+ */
+interface SectionStorageManagerInterface extends DiscoveryInterface {
+
+  /**
+   * Loads a section storage with no associated section list.
+   *
+   * @param string $id
+   *   The ID of the section storage being instantiated.
+   *
+   * @return \Drupal\layout_builder\SectionStorageInterface
+   *   The section storage.
+   */
+  public function loadEmpty($id);
+
+  /**
+   * Loads a section storage populated with an existing section list.
+   *
+   * @param string $type
+   *   The section storage type.
+   * @param string $id
+   *   The section list ID.
+   *
+   * @return \Drupal\layout_builder\SectionStorageInterface
+   *   The section storage.
+   *
+   * @throws \InvalidArgumentException
+   *   Thrown if the ID is invalid.
+   */
+  public function loadFromStorageId($type, $id);
+
+  /**
+   * Loads a section storage populated with a section list derived from a route.
+   *
+   * @param string $type
+   *   The section storage type.
+   * @param string $value
+   *   The raw value.
+   * @param mixed $definition
+   *   The parameter definition provided in the route options.
+   * @param string $name
+   *   The name of the parameter.
+   * @param array $defaults
+   *   The route defaults array.
+   *
+   * @return \Drupal\layout_builder\SectionStorageInterface|null
+   *   The section storage if it could be loaded, or NULL otherwise.
+   *
+   * @see \Drupal\Core\ParamConverter\ParamConverterInterface::convert()
+   */
+  public function loadFromRoute($type, $value, $definition, $name, array $defaults);
+
+}