Last modified: 2006-04-28 03:53:05 UTC
A category represents a set of pages.
It would be useful, if you can do the usual set operations OR (join), AND, XOR, etc.
on these sets.
Example: you have categories in two dimentions: a) time b) content. Now you would
like to see all articles that are both in time=2005 AND content=meeting minutes
(in wiki syntax [[Category:2005]] AND [[Category:Meeting minutes]]). Especially
usefull with wiki as collaboration tool.
This is part of the [[m:DynamicPageList]] functionality, though I don't believe
that it's enabled on Wikipedia or Meta (it IS, however, enabled on Wikinews)
*** This bug has been marked as a duplicate of 5244 ***