MediaWiki:Apihelp-import-param-interwikiprefix
From Global Knowledge Compendium of Traditional Crafts and Artisanal Techniques
For uploaded imports: interwiki prefix to apply to unknown usernames (and known users if $1assignknownusers is set).
For uploaded imports: interwiki prefix to apply to unknown usernames (and known users if $1assignknownusers is set).
