Semantic accuracy of dcat:Dataset dct:modified in euro DCAT-AP profile

[MikiDi]

In the current DCAT-AP export profile, the CKAN dataset metadata_modified date is mapped to the dcat:Dataset dct:modified date.

ckanext-dcat/ckanext/dcat/profiles/euro_dcat_ap_base.py

Lines 362 to 367 in be3c8d6

	# Dates
	items = [
	("issued", DCT.issued, ["metadata_created"], Literal),
	("modified", DCT.modified, ["metadata_modified"], Literal),
	]
	self._add_date_triples_from_dict(dataset_dict, dataset_ref, items)

From my point of view there is a distinction between the dataset contents modification date and the dataset metadata modification date.

This might be something to address when considering #353