Revise section on dataset series as discussed in issue 1272

[andrea-perego]

Summary of changes:

• Remove subsetting as a typical example of dataset series
• Revise section on property values inheritance to include properties describing dataset series themselves - as dct:accrualPeriodicity
• Move to separate section the description of how dataset series are specified in existing DCAT implementations

Preview: https://raw.githack.com/w3c/dxwg/dcat-dataseries-issue1272-rev/dcat/index.html#dataset-series

Diff: https://services.w3.org/htmldiff?doc1=https%3A%2F%2Fraw.githack.com%2Fw3c%2Fdxwg%2Fdcat-dataseries-issue1272%2Fdcat%2Findex.html&doc2=https%3A%2F%2Fraw.githack.com%2Fw3c%2Fdxwg%2Fdcat-dataseries-issue1272-rev%2Fdcat%2Findex.html#dataset-series

[riccardoAlbertoni]

Thanks a lot, Andrea, for summarizing the discussion scattered in different issues in this PR. I think this is quite an improvement, I just add the reference to the discussion on hasPart. I support the idea of merging this to dcat-dataseries-issue1272 after committing my suggestion.

[andrea-perego]

Thanks a lot, Andrea, for summarizing the discussion scattered in different issues in this PR. I think this is quite an improvement, I just add the reference to the discussion on hasPart. I support the idea of merging this to dcat-dataseries-issue1272 after committing my suggestion.

Thanks, @riccardoAlbertoni . I applied your revision via commit 8b907eb , and removed the duplicate ref to #1307 via commit 07df66e

If you are happy with this, we can merge this PR.

[riccardoAlbertoni]

I am happy thanks. So I have merged.