Chapter 5.2. (5th draft of the revised DCAT-AP) lists the controlled vocabularies that must be used for certain properties. The recommendation to use controlled vocabularies is good, but making the use of a certain, limited vocabulary mandatory complicates applying the profile.
This issue has been reported by Pirjo-Leena Forsström:
http://joinup.ec.europa.eu/mailman/archives/dcat_application_profile/2015-August/000296.html
Component
DocumentationCategory
Controlled vocabulary
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Analysis: The declaration of some controlled vocabularies as mandatory is done to enable a minimum level of interoperability. Any implementation is free to use controlled vocabularies in addition to the ones that are mandatory, e.g. in a national extension, but those may not always be understood beyond national borders.
Proposal: Add further clarification in section 5.3 to explain that the objective of making vocabularies mandatory is to ensure minimal interoperability.