I think it'd be useful for most multilingual
MediaWiki installations
that use interlanguage links to have such hidden <link> elements.
Speaking of which - this reminds me of an idea I had a while ago and I
was wondering if anyone would be interested to hear this. Currently many
Wikipedia pages in Google search results are redirects (for example,
Google for "nonogram" and look at the seventh search result). I was
wondering if there is a <link> element one could use to say that another
URL is the "real" page? Then the page returned for a redirect's URL
would tell search engines the URL of the page it's redirecting to.
Timwi