|Open||None||T109579 [Epic] Give more sister projects access to Wikidata|
|Stalled||None||T54971 [Goal] Sitelinks and arbitrary accesses to Incubator, OldWikisource and BetaWikiversity|
|Open||None||T138332 interwiki links to/from Multilingual Wikisource|
|Resolved||Ladsgroup||T204706 Investigation: status of oldwikisource in relation to wikidatawiki|
This is a know issue and is handled in T54971. Problem is that https://wikisource.org is a multilingual version of Wikisource and can't be handled easily in the current code. See also https://www.wikidata.org/wiki/Wikidata:Wikisource/Development. I think @Lydia_Pintscher could tell more about this.
It is a blocking issue in so far that an item can only link to one page on a given wiki. If several languages are covered on one wiki then we also usually have the case that we have two pages for one concept on that wiki that would both need to be linked in the same item.
This is a limitation, but I don't see why it should be blocking for this task. We can just link to a disambiguation page. And Wikisource doesn't work like Wikipedia... on any WS (not just the multilingual one) you can have multiple versions of the same text (different edition, different translations...) But still, when the other Wikisources were given access to Wikidata, this was not considered a blocking issue...
I run into this problem, when dealing with unusual sitelinks, which are not displayed. For example Q62081484 seems to be an empty item with nothing in it other than label in italian, but closer look shows that it also has sitelink to https://wikisource.org/wiki/Li_fioreti_de_mess%C3%AA_san_Francescho. At the moment GUI does not allow you to see, or change it. According to this query there are only 11 items with sitelinks to old wikisource. We need to either remove them and prevent future creation, or show sitelink in GUI. Perhaps in "other sites" section, or as mulwikisource in wikisource section.
I think this might have been mentioned before in a different ticket, but anyways.
This wouldn't actually be a problem for the multilingual Wikisource. The reason is the way that different editions of works are handled in Wikidata (see WikiProject Books): Each edition of a work should have its own item. Transcriptions on Wikisource are of specific editions of a work. So then, even if there are several transcriptions of the same work in Wikisource, those will still be different editions, and would therefore have separate sitelinks. The problem with several pages on the same item would really only happen for project pages and the likes, but that's already the case for Meta and Commons (which are supported), so I don't think that should be a blocker for this task.