Based on the discussion during the DCAT-AP workshop in Rome (13/05/2016), we extracted the following key points:
The participants discussed the different approaches for expressing relationships between datasets as proposed by the guideline on Joinup.
Some participants expressed their concern that one of the proposed workarounds proposed by the guidelines, i.e. describing members of a group as different distributions of a dataset, might create confusion. Is this use of Distribution compliant to its definition in DCAT?
In the current situation, i.e. with the current DCAT and DCAT-AP versions, expressing relationships requires a lot of (manual) work.
Other workarounds proposed by the guideline might also create confusion. For example, the guideline proposes using the hasPart and isPartOf attributes on the Dataset class. For some participants of the discussion, this could create confusion if the difference between a dataset and a catalogue are not clear anymore.
Regarding versioning, the participants noted that there should be a possibility to link a new data set to a previous version of the dataset directly.
The participants think that the best solution would be to extend DCAT, to then also extend DCAT-AP, foreseeing an option to express relationships between data sets.