|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.