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On [[Special:Whatlinkshere/PAGE]], all of the pages that link to PAGE are
listed. A drop-down box for selecting which namespace to display would be useful
for WikiPrject Disambigution (located on Wikipedia as [[WP:WPDAB]], goal #2),
and similar things. e.g., if "Template talk" were selected, only Template talk
pages that link PAGE would be listed. 

What I had in mind was something similar to [[Special:Recentchanges]], which
includes:

1. [[MediaWiki:Namespace]]
2. A drop-down box containing 
    a. all - (default)
    b. (Main) - (namespace 0)
    c. The rest of the positive namespaces in numerical order
3. A "Go" button
4. An "Invert selection" checkbox

Please also include a similar layout as above for the "File links" section at
the bottom of an Image page.

This can be completed manually (it's easy to tell if something's in a namespace
just by glancing at it), but a machine selection would be time-saving and useful
if both technically feasible and latently useful for all MediaWiki software
users. Thanks.