10.3.4 Properties with MAY use a controlled vocabularies

[idevisser]

The usage note for dct:publisher and dct:spatial contains the words MUST, must and should. How should i read that in a chapter where the controlled vocabularies are listed that MAY be used?

[jakubklimek]

For publisher:
The Corporate bodies NAL MUST be used for European institutions and a small set of international organisations. In case of other types of organisations, national, regional or local vocabularies should be used.
This means that in general, the NAL does not have to be used. That is why it is in MAY. But, for some publishers, it MUST be used.

An alternative would be to move this into MUST section, but specify, that only EU institutions must obey, which might be more confusing to more readers.

For spatial:
The EU Vocabularies Name Authority Lists must be used for continents, countries and places that are in those lists; if a particular location is not in one of the mentioned Named Authority Lists, [[GEONAMES](https://semiceu.github.io/GeoDCAT-AP/drafts/3.1.0/#bib-geonames)] URIs must be used.
Here it seems that all cases are covered by some MUST (default being GEONAMES), also MUST. Since member states also use their national vocabularies here, I think this issue needs to be discussed on DCAT-AP level, from where this originates, as there are options:

1. Moving this to AT LEAST 1, allowing MS extensions
2. Keeping this in MAY, relaxing the wording
3. Moving this to MUST, disallowing MS extensions.