Do we need a separate class for DatasetSeries?
Below some leftover of the discussion in issue #868

for future reference (v3?) I agree DatasetSeries should be a separate subclass of dcat:Resource. Noting that a series would have all the properties that are specific to dataset, from a modeling perspective it might be treated as a subclass of Dataset, with the addition of a mandatory(2..N) 'hasPart' relationship, and properties indicating how the 'granules' in the collection are defined (time, space...).
Originally posted by @smrgeoinfo in #868 (comment)

Yes @smrgeoinfo that is my thinking as well.
Richer treatment of relations between resources (esp. datasets) is one of the features that has been added in DCAT2, so we have the platform already.
https://www.w3.org/TR/vocab-dcat-2/#qualified-relationship
Originally posted by @dr-shorthair in #868 (comment)