Ok to link in action=info. No for link at the bottom of each page.

I think we should have the canonical item URI on action=info. For Wikidata, that would be https://www.wikidata.org/entity/Q123. Content negotiation applies, so this can be used for exporting too, but not easily via the browser (which will prefer, and get, html).

In addtion, we could link to the JSON export (and perhaps also RDF and Turtle): https://www.wikidata.org/wiki/Special:EntityData/Q1.json etc.

Canonical item URL plus json, rdf and turtle sounds good to me.

If I am not wrong, the easier way to add a link to the JSON, RDF and Turtle is to modify [Mediawiki:Pageinfo-footer](https://www.wikidata.org/w/index.php?title=MediaWiki:Pageinfo-footer&action=edit). I wanted to do it, but I think this has some issues to keep in mind:

1. Obviously, it is protected.
2. The content isn't localized and can't be translated in TranslateWiki.net, so it only appears if we read the page in English.
3. I think the footer of the info page of an item isn't useful, neither for the current external tools listed nor for the links to download the item in this formats, because it is below "Page properties" section and it could be very long, so what is at the end of the page is practically "invisible".

Considering the third point I think these links should be above the «Page protection» section. But if I am not wrong we can't do it, because Mediawiki:Pageinfo-footer is configured to be in the footer, as its name indicate, and it may be useful for another stuff. So I think it could be interesting to create another system message (e.g. Mediawiki:Pageinfo-externaltools) and integrate it in Wikibase, specifically in the [InfoActionHookHandler](https://phabricator.wikimedia.org/diffusion/EWBA/browse/master/client/includes/Hooks/InfoActionHookHandler.php) if I am not wrong.

Of course, I am saying all this from the perspective of someone who has never edit Wikibase nor Mediawiki. But I am very interested to learn a bit how can I do this kind of easy tasks to help to the development of Mediawiki/Wikibase. If someone might guide me a bit to be sure of what I should do to make it fine, I would be very grateful. Thanks in advance!