public VocabularyInterface::getHierarchy()

Denotes that no term in the vocabulary has a parent. File core/modules/taxonomy/src/VocabularyInterface

public VocabularyInterface::getDescription()

public VocabularyInterface::setHierarchy($hierarchy)

Provides an interface defining a taxonomy vocabulary entity. Hierarchy interface

Denotes that one or more terms in the vocabulary has a single parent. File core/modules/taxonomy/src

Denotes that one or more terms in the vocabulary have multiple parents. File core/modules/taxonomy/s