As discussed on the Wikidata Project chat please create a redirect from https://www.wikidata.org/wiki/Wikidata to https://www.wikidata.org/wiki/Wikidata:Main_Page. This can't be done from the gui as ns0 is meant for items and this isn't an item
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Lexemes are in their own namespace and I don't think it'd be good for re-users to mix them all together. Right now you can rather easily split Items, Lexemes and Properties.
@Micru This isn't invalid. The redirect is not meant for people using Wikidata itself, but for people that type in [[:d:Wikidata]] on another project and expect to reach the main page of Wikidata. Since ns0 is for items it's impossible to create a redirect ourselves. The interface and the API don't allow for this.
That's because the prefix w in interwikis points to enwiki by default on multilingual projects.
I guess you know the cause - wikipedia.org isn't a project but rather a disambiuation between projects, wikidata.org is a dedicated project. Also, it'll be more understandable if [[:d:Wikidata]] would take you to the item about Wikidata. At least, it would be consistent with other's project state.
Well, even [[:d:Main Page]] or [[:d:Main page]] won't take you to the main page (which is more stranger, because both [[:w:Main page]] and [[:w:Main Page]] would take you to the main page of the English Wikipedia and this is true at least about cswiki as well ([[:w:cs:Main Page]] and [[:w:cs:Main page]] would take you to the main page of the Czech Wikipedia).
At this place, I'd like to remind that both https://www.wikidata.org/wiki/Main_page and https://www.wikidata.org/wiki/Main_Page used to exist, but were deleted by @Vogone as "bad hack". The question is what a hack is. I'm not an amdin nor a sysadmin so I cannot check, but maybe it can direct us somewhere.
Martin
Seems to me, the solution to this problem is to simply modify the error message that is shown when a nonexistent page title is requested. (See my comment at the local discussion, and follow up there, if desired.)
My question is more about why it got deleted than what was in it - that is somehow clear from the title itself.
If I remember correctly, I was asked by Lydia to delete this because the WMDE developers had some technical concerns due to ns0 being the item namespace. But since this is almost 5 years ago by now, my memory could be wrong.
As to why I called it a "hack": I created this redirect by importing the redirect from metawiki which is obviously a rather unusual way of creating pages in the wikidatawiki ns0.
The suggestion I alluded to above (T195793#4240816) has been put into effect. See d:MediaWiki:Wikibase-noentity and the associated talk page. Not sure how that change affects this task, if at all.
but for people that type in [[:d:Wikidata]]
Why would anyone do that? If someone wants to reach WD Main page from another wiki they should use [[:d:]], not [[:d:Wikidata]].
Unless we implement some form of AI that guesses what the user actually wanted I suggest this to be closed as invalid.
It would make sense if [[:d:Wikidata]] opened the item on Wikidata, but then I guess it should be another ticket and with a larger scope — it shall open an item that has a label in the current interface language that matches the title provided or the search results if there are several items with such label — or something along such lines.
I fear I have to agree with Base. This will just turn out pretty messy for re-users of our data.