Details:
Values: none | narrower | any Default: any Description: This refers to extensions by a third party, not to extensions by the owner of the vocabulary; the owner will always be able to revise the vocabulary. I.e., if the value is 'none', the referenced vocabulary may not be extended by third parties; if the value is 'narrower', the vocabulary may be extended by narrower terms that have an existing term as a parent; if the value is 'any', the vocabulary may be extended by additional terms on any level. This value must be 'all', empty or missing, if the value 'vocabulary' is empty or missing; in this case any vocabulary may be used.
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