This procedure has two potential complications. First, an article
may not exist in the target language; in this case, we simply omit it.
Second, Wikipedia contains null articles called redirects that
merely point to another article, called the target of the redirect.
These are created to catch synonyms or common misspellings of
an article. For example, in English, the article ‘‘Flu’’ is a redirect to
‘‘Influenza’’. When a user visits http://en.wikipedia.org/wiki/Flu,
the content served by Wikipedia is actually that of the ‘‘Influenza’’
article; the server does not issue an HTTP 301 response nor
require the reader to manually click through to the redirect target.