The node representing the book. Type:

public BookOutline::childrenLinks(array $book_link)

protected BookManager::buildBookOutlineRecursive(&$links, $parents,

public BookAdminEditForm::buildForm(array $form, FormStateInterface

public BookOutlineStorage::countOriginalLinkChildren($original)

public BookBreadcrumbBuilder::__construct(EntityManagerInterface

protected BookManager::doBookTreeCheckAccess(&$tree)

public BookOutlineStorageInterface::insert($link

Defines a storage class for books outline. Hierarchy class \Drupal\book\

public BookManager::deleteFromBook($nid) Deletes