Import refers to the process of bringing pages from one wiki into another.
Importing pages can be a power-tool that can easily do unexpected and dangerous things to your wiki. Only import content this way if you know what you are doing.
There are two kinds of import, both of which are accessible via the Special:Import page, the Transwiki and Upload import.
Transwiki import, also known as interwiki import, lets you import pages from one wiki to another. The settings of the destination wiki decide which source wikis are allowed. MediaWiki:import-interwiki-text (Select a wiki and page title to import. Revision dates and editors' names will be preserved. All imports from other wikis are logged at the import log.) might appear during the process.
Transwiki import is equivalent to going to Special:Export on the source wiki, downloading the resulting XML file, and then importing it using XML import, except that you might only have permissions to do one but not the other. When transwiki importing, the Include all templates and transcluded pages. option imports all the templates used an imported page.
This is not necessarily all templates the page depends on to run (if you import a template and its dependencies, it does not include any subtemplates unless they happen to be transcluded with the base template page itself). This option can easily import more pages than you intended, should generally only be checked if you really know what you are doing, as it can screw up the wiki in ways that take a lot of effort to undo.
To check if your wiki has Transwiki import sources configured and see which wikis they apply to, you can use the API:
The configuration is specified as: <param name="interwikisource" description="For interwiki imports: wiki to import from"> …
See also: Manual:Importing XML dumps
Upload Import, lets you import an XML file generated by exporting pages from another wiki. This displays the message MediaWiki:Importtext (Please export the file from the source wiki using the export utility. Save it to your device and upload it here.)
To export wiki pages to a file, see Help:Export . Generally, any user can export pages to a file, but importing them into a wiki requires the importupload user right. This is granted to sysops in the default configuration, but on WMF wikis is its own "importer" group. Unlike with transwiki import, which always preserves content from the source wiki unchanged, nothing stops you from editing the XML file before importing it, allowing backdating of edits, fake usernames, or other ways of rewriting history.
This editing process can be used for:
See Manual:XML Import file manipulation in CSharp for an example of handling these XML files using C# in Visual Studio .NET.
By default, imported edits appear with an interwiki prefix, like meta>Example. See an example of an imported history here.
If you tick the Assign edits to local users where the named user exists locally checkbox, then edits will be attributed to the user with no interwiki prefix if such a user exists. This makes it not easily possible to distinguish between imported edits and edits originally made on the wiki.
IP addresses stay the same and if you apply the ip tag next to a reserved username, it will work too.
Imported edits never show up in recent changes , but the act of performing the import itself does.
By default, imported edits appear in the same namespace and title on the target wiki as they did in the source wiki. The import form allows you to specify the following:
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