MediaWiki:Apihelp-import-param-interwikiprefix
For uploaded imports: interwiki prefix to apply to unknown usernames (and known users if $1assignknownusers is set).
This is an information resource mainly written for trans US citizens considering emigrating to another country, although we hope it is useful beyond that.
Please treat this wiki as a starting point for your own research, not as an authoritative source of truth or as legal advice.
Many of the authors have gone through the process themselves and want to share what they have learned.
For uploaded imports: interwiki prefix to apply to unknown usernames (and known users if $1assignknownusers is set).