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I recategorized some of the portals to match what seemed to be the generally adopted approach. In order to have a consistent approach to categorizing portals, I thought it would be helpful to document that approach. Please feel free to comment on these guidelines or propose changes.
For portal subcategories, only the main portal(s) from the subcategory should be included in the Portals category. The remainder of the portals in the subcategories should only be included in the subcategory. As additional portal subcategories are created, portals that are included in the subcategories should be recategorized according to these guidelines. These guidelines apply recursively to subsubcategories and their parent subcategories.
I've updated the entire spiel (some things changed in the intervening 3.5+ years, and some topics were not originally covered at all). — SMcCandlish [talk] [cont] ‹(-¿-)› 10:44, 21 December 2009 (UTC)[reply]
Currently some portal categories are (directly) in a content category (example) and some (example) are not (an inconsistency).
Currently some content categories contain just a portal and some contain both a portal and a portal category (e.g. Category:Religion directly contains Portal:Religion and Category:Religion portals (as well as an icon)). This is an inconsistency and adds to the clutter in content categories.
Portal categories often contain administration pages (example) and things like templates (example). The principle we normally follow is that such pages shouldn't be under content categories.
Every portal page (e.g. Portal:Foo) should be (directly) in the corresponding content category (Category:Foo). It's not possible to fully check this using category intersection whilst some portal categories are in content categories (although there's also another reason why that doesn't currently work).DexDor(talk) 22:21, 5 January 2016 (UTC)[reply]