Negative Knowledge for Open-world Wikidata
Hiba Arnaout, Simon Razniewski, Gerhard Weikum, Jeff Z. Pan · Companion Proceedings of the Web Conference 2021 · 2021
The Wikidata knowledge base (KB) is one of the most popular structured data repositories on the web, containing more than 1 billion statements for over 90 million entities. Like most major KBs, it is nonetheless incomplete and therefore operates under the open-world assumption (OWA) - statements not contained in Wikidata should be assumed to have an unknown truth. The OWA ignores however, that a significant part of interesting knowledge is negative, which cannot be readily expressed in this data model.