See: Wikipedia:Category intersection for a more recent proposal.
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This is a proposal advocating the implementation of category math feature to the MediaWiki software on the English Wikipedia. Category math feature allows Wikipedians to list categories by intersection, union and subtraction. A typical Wikipedia user could find the intersection of two or more categories to be useful and efficient.
Examples:
- Category:Guyanese actors → Category:Guyanese people & Category:Actors
- Category:Actors by nationality would no longer be needed
- Category:Actors / Category:Actresses → Category:Actor / Category:Male person / Category:Female person
- Category:Child actors by nationality → Category:Child actors / Category:Actors / Category:Male person / Category:Female person / Category:Guyanese people
- Category:Living people & Category:Golfers → Living golfers
The concern for this well favoured top-level concept would be how it would be implemented; how it would affect the performance of the live Wikipedia.
Wikinews have already implemented something like it with meta:DynamicPageList.
The {{child actor birth date}} template automatically categorizes actors into:
- actors who are currently children (under 13)
- teenaged actors (13 to 19)
- former child actors (over 19)