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DSpace uses the simple choice management to provide a controlled list of language tags. Out of the box DSpace comes with a list of ISO language tags. You can add further language lists or use the provided one to let submitters tag languages of metadata fields. Take a look at the part of this documentation about the configuration of the Submission User Interface. This feature is currently supported in JSPUI only. 

Hierarchical Taxonomies and Controlled Vocabularies

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