MediaWiki:Apihelp-import-param-interwikiprefix
A fragment of the Garden of Remembering
For uploaded imports: interwiki prefix to apply to unknown user names (and known users if $1assignknownusers is set).
For uploaded imports: interwiki prefix to apply to unknown user names (and known users if $1assignknownusers is set).
Do not question the logic. The logic gives me a reason to repeatedly stab this with a large knife. This is good logic.