As Thad said most of the ISBN 13 set in book/book_edition/ISBN have been moved into media_common/cataloged_instance/isbn13 so I believe only import media_common/cataloged_instance/isbn13 is a first good step even if we miss some data. I believe that there are so many more triple that are more important to import than these missed ISBNs. But if someone propose a good way to import them too I am ready to implement it.
@Marco
Thank you very much for the links to these discussions. I was not aware of them.
> 1. Are these mappings [1, 2] coming from earlier discussions [3] already validated/integrated?
Not yet, but I plan to integrate [1] into the mapping with a human validation. For [2] I currently don't do anything related to types but it may be something interested to do if I have time.
> 2. As the maintainer of the DBpedia mapper bot, the procedure to add schema mappings to Wikidata classes and properties has already been discussed [4].
> The bot code can be easily adapted for Freebase, let me know and I can volunteer to open a request for the new bot.
Thank you very much! It would be very nice to do so. Yes, please, open a such request.
About these mapping I have made a property proposals for a "subproperty" [4] and a "subproperty of" [5] properties in order to have something less strict than "equivalent property" for mappings.
Thomas