Editing Help:Interlanguage links (section)

=== Wikidata ===
[[File:Interlanguage links provided by WikiData.png|thumb|Click on ''Edit links'' to add links to the Wikidata page]]

[[WP:Wikidata|Wikidata]] is a sister project of Wikipedia; it is a collaboratively edited knowledge base. Part of this project is to centralize the interlanguage links for all the Wikipedia projects. The "Languages" list for a page contains  a list of links to a version of that page in different languages. Editing that list on Wikidata is the standard procedure to add or modify interlanguage links.

==== Adding a new link ====
"Languages" in a menu at the upper right (or in the sidebar in non-default skins) shows the Wikidata language list. At the bottom is a link labelled "Edit interlanguage links" (or "Edit links" in non-default skins; mobile viewers may lack such a feature). Clicking on this will reveal the Wikidata page. To modify entries on the list:
# Scroll, if necessary, to the box marked "Wikipedia" and click on "edit" at the top of that box.
# Click on the greyed-out "wiki" field, the final item on the list, and enter a language code (see [[list of ISO 639-1 codes]] for all language codes).
# Click on the greyed-out "page" field (now visible) and paste or type in the name of the article as it appears in that language's Wikipedia.
# Click on "publish" at the top of the box.

Modifying or removing an existing interlanguage link is similar. To modify a link, click "edit", then modify the text of a link and click "publish". To remove a link, click "edit", then click the trash can icon for the link you wish to remove.

If you get an error message like "Site link{{nbsp}}... is already used by item Q{{nbsp}}...", this means that there is already an item in Wikidata pointing to the article you are trying to link to. Wikidata does not allow more than one item to point to a single article in a Wikipedia. This can happen for one of two reasons:
* The two items really are the same, and might need to be merged: see [[d:Help:Merge]].
* The scope of the two items is not in fact the same (typically, the article in one language is wider in scope than the article in the other language) and they should not be linked, unless there exists a [[Wikipedia:Redirect|redirect]] between the two items on one of the languages. Unfortunately, there is no mechanism in Wikidata at present for linking articles that are related, but different in a scope – it is possible to do this with [[#Local links to override Wikidata interlanguage links|local links]], however.

It may take several minutes for the link to show up in the article's "Languages" list. To enable links between [[Wikipedia:Template namespace|template]]s, you must explicitly [[Wikipedia:Purge|purge the server's cache]] for each template.

===== Finding interlanguage links for an article =====
There are many ways Wikipedia articles in other languages can be found. These include translating the article's title and its synonyms to other languages and searching for them on the respective language-versions of Wikipedia or on Google, searching for <code>articletitle site:wikipedia.org -site:en.wikipedia.org</code> (for non-English Wikipedia articles), and checking related or superordinate articles or categories in other Wikipedias.