The type of hierarchy allowed within the vocabulary.
Possible values:
- TAXONOMY_HIERARCHY_DISABLED: No parents.
- TAXONOMY_HIERARCHY_SINGLE: Single parent.
- TAXONOMY_HIERARCHY_MULTIPLE: Multiple parents.
Type: integer
File
- core/
modules/ taxonomy/ taxonomy_vocabulary.class.inc, line 41
Class
- TaxonomyVocabulary
- Taxonomy vocabularies allow the grouping of taxonomy terms.
Code
public $hierarchy = TAXONOMY_HIERARCHY_DISABLED;