Currently if you are on $1 language subdomain of some Wikimedia project the [[chapter:$2]] interwiki link will bring you to $1.wikimedia.org/wiki/$2 , which will work if the chapter has his hosted by the WMF, but if the chapter has his own wiki will (at best) redirect you to the chapter main page because that wikimedia.org subdomain is a redirect to the chapter's domain.
Currently you can't use interwiki to link specific pages on those wikis: that's inconsistent and unhandy and forces us to have unwanted "nofollow".
The interwiki should bring you directly to the chapter's wiki page when it's the case (or maybe the redirect from wikimedia.org subdomains should be rewritten, I don't know how these things work). Complete list:
*http://www.wikimedia.org.ar/wiki/$1 <- ar:chapter:
*http://wikimedia.org.au//wiki/$1 <- au:chapter:
*http://www.wikimedia.ch/$1 <- ch:chapter:
*http://www.wikimedia.cz/web/$1 <- cz:chapter:
*http://wikimedia.hk/index.php/$1 <- hk:chapter:
*http://wiki.media.hu/wiki/$1 <- hu:chapter:
*http://www.wikimedia.or.id/wiki/$1 <- id:chapter:
*http://www.wikimedia.org.il/$1 <- il:chapter:
*http://wikimedia.it/index.php/$1 <- it:chapter:
*http://wikimedia.tw/wiki/index.php5/$1 <- tw:chapter:
Thank you.
Version: unspecified
Severity: enhancement
See Also:
https://bugzilla.wikimedia.org/show_bug.cgi?id=20061