public BookOutlineStorageInterface::getBookSubtree($link

protected BookManager::buildBookOutlineData(array $links, array $parents

public BookManagerInterface::bookTreeCollectNodeLinks(&$tree

public BookOutlineStorageInterface::get

public BookOutlineStorageInterface::loadMultiple($nids

Provides a form for administering a single book's hierarchy. Hierarchy class \Drupal\Core\Form\

protected BookAdminEditForm::bookAdminTable(NodeInterface

protected BookManager::flatBookTree(array $tree, array &$flat)

public BookManagerInterface::bookTreeCheckAccess(&$tree

The book export service. Type: