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namespace Drupal\entity_hierarchy in Entity Reference Hierarchy 8

Classsort descending Location Description
HierarchyBreadcrumbBuilder src/HierarchyBreadcrumbBuilder.php Provides a breadcrumb builder for nodes in a book.
HierarchyManager src/HierarchyManager.php Defines a hierarchy manager.
HierarchyManagerInterface src/HierarchyManagerInterface.php Provides an interface defining a hierarchy manager.
HierarchyOutlineStorage src/HierarchyOutlineStorage.php Defines a storage class for hierarchies outline.
HierarchyOutlineStorageInterface src/HierarchyOutlineStorageInterface.php Defines a common interface for hierarchy outline storage classes.