Manual:$wgImportSources

From MediaWiki.org

Interwiki: $wgImportSources
List of interwiki prefixes for wikis we'll accept as sources for Special:Import (for sysops).
Introduced in version:	1.3.0 (r3119)
Removed in version:	still in use
Allowed Values:
Default Value:	array();

Other settings: Alphabetical | By Function

[edit] Details

List of interwiki prefixes for wikis we'll accept as sources for Special:Import (for sysops). Since complete page history can be imported, these should be 'trusted'.

[[m:Help:Help]] m:Help:Help
[[w:Interwiki]] w:Interwiki

If a user has the 'import' permission but not the 'importupload' permission, they will only be able to run imports through this transwiki interface.