Am 11.08.2016 um 23:12 schrieb Peter F. Patel-Schneider:
Until suitable versioning is part of the Wikidata JSON dump format and contract, however, I don't think that consumers of the dumps should just ignore new fields.
Full versioning is still in the future, but I'm happy that we are in the process of finalizing a policy on stable interfaces, including a contract regarding adding fields: https://www.wikidata.org/wiki/Wikidata:Stable_Interface_Policy. Please comment on the talk page.