Last modified: 2006-05-11 10:48:45 UTC
I would like to request a feature to generate lists based on two or more categories. That is, for example, *{{List: Category:Albania AND Category:Business}} results in a list of pages in the both category at the same time. *{{List: Category:Albania OR Category:Belgium}} results in a list of pages in at least either of Albania or Belgium. *{{List: Category:Albania NOT Category:Bosnia}} results in a list of pages in A but not in B. This is helpful in order to index and re-organize Wikinews, where inter-article linking is not as prevalent as Wikipedia or some others, but need to organize article in multiple ways to cater to the readers' interests, as well as writers'. This feature could produce a heavy load to the server if the following is allowed. *{{List: NOT Category:Albania NOT Category:Bosnia}} which means a list of all pages neither of A or B (potentially a huge list). So the feature should not allow NOT at the beginning. Another is to limit the number of categories dealt within one request. {{List: Category:A OR Category:B OR Category:C OR Category:D OR .....}} I don't know where the limit should be placed, but 4 would be reasonable. A nice extension is to be able to define the order of calculations. For example, *{{List: Category:2004 AND (Category:Sports OR Category:Entertainment)}} or *{{List: Category:2004 AND {{List: Category:Sports OR Category:Entertainment}}}} resulting in the list of pages in (1) either sports OR entertainment AND (2) also in 2004. Finally, I suppose it is useful even when it is not dynamically generated. So when someone use {{List: Category:Politics and conflicts AND Category:Unreviewed}} it could be replaced by the list at that moment, as opposed to generate the list everytime the page is viewed by someone.
Now a version of this feature is submitted at #1411.
Maybe "CatScan" can help you a little bit: http://tools.wikimedia.de/~daniel/WikiSense/CategoryIntersect.php? wikilang=en&wikifam=.wikinews. org&basecat=2005&tagcat=Sports&userlang=en
This feature would help Wikipedia, too. With the current system, we have to decide on a particular, arbitrary, category structure. For example, [[Category:American people]] is subcategorized in a very ad hoc way. Also, [[Category:Nationalities by occupation]] and [[Category:Occupations by nationality]] are simply two different ways of intersecting [[Category:People by occupation]] and [[Category:People by nationality]]. If we had a really good way to automatically generate category intersections, then we could dramatically simplify the category structure on the English Wikipedia.
(in response to #3) The category usage would change (to ab better one) too. Marked as duplicate of #5244 *** This bug has been marked as a duplicate of 5244 ***
