Maybe it's Sunday and I'm not really awake yet, but...
There's a beautiful, long, complete article about Berlin:
http://en.wikipedia.org/w/index.php?title=Berlin
However:
http://en.wikipedia.org/w/api.php?action=query&prop=images&titles=B…
No images
http://en.wikipedia.org/w/api.php?action=query&prop=links&titles=Be…
No links
http://en.wikipedia.org/w/api.php?action=query&prop=extlinks&titles…
No external links
Likewise, no templates and no categories. Backlinks ("what links
here") works, though.
Now, I followed a link to [[Berlin-Schönefeld International Airport]],
and looked at "what links here", and there are lots of articles, but
[[Berlin]] is not there.
So it's not a problem with the API - the information apparently wasn't
stored in the database in the first place.
This will probably be updated on the next vandalism edit ;-) but I
have to ask: is this just a fluke, or do we have a problem?
Magnus