Forum:Interwiki map

Does anyone know where the Interwiki map is stored and how to update it? Before making the change please show me so I can learn how it is done. We need to be able to connect to Wikidata. Wikidata is a massive database that contains formatted data about about churches, cemeteries, and people that are not in Wikipedia. It assigns an authority control number to that object that stays the same even if the name of the object changes. It links to other outside databases. We have to assign "d:" and "wikidata:" as shortcuts for the string "//www.wikidata.org/wiki/$1". --Richard Arthur Norton (talk) 16:15, July 26, 2015 (UTC)