Some illustrative examples:

• Book with ISBN (from svwp dump), work & edition
• Book on Runeberg, work & edition. Maybe a multi-volume one (like Ugglan) to see how those can be modelled
  • Nordisk familjebok, work
  • Nordisk familjebok, 2nd edition
  • volume of Nordisk familjebok, 2nd edition
• Item on sv.wikisource that is a translation

@Lokal_Profil – here are the example items we talked about today.

Våra fiskar:
The work item should be P31:Q47461344 right? Q56676033 seems to use P31:book which I believed is reserved for items about individual (physical) books. For non-fiction the correct item is Q27801 (non-fiction literature)

Nordisk familjebok.
This is a surprisingly clear and straightforward model. We could deepen it on more step by adding an individual article (can use Q27604016 as a template) to get full model.

There is a scary amount of duplication in the edition item of work specific data but since that is in line with the Wikidata structure I assume we are not to blame (and I can imagine special cases when even author differs).

Re: duplication. Yes, IIRC (from some discussion on project:Books) this is a feature, as it makes it possible to use the data e.g. in {{Cite Q}}. And it makes it usable even if there's no work-level item.