Sorry, those were poorly chosen examples. Here are some better ones: Copy_to_Wikimedia_Commons_(bot-assessed) Stub-Class_biography_articles Automatically_assessed_biography_articles WikiProject_Disambiguation_pages Creative_Commons_Attribution-ShareAlike_3.0_files I don't think that any of these are hidden, at least by looking for them in page_props. These are all from the enwiki-20121201 dump. Thanks, Robert -----Original Message----- From: Petr Onderka [mailto:gsvick@gmail.com] Sent: Wednesday, February 13, 2013 9:34 AM To: Robert Crowe Cc: xmldatadumps-l(a)lists.wikimedia.org Subject: Re: [Xmldatadumps-l] Housekeeping categories? Both of the categories you mentioned *are* hidden, so I think you can use that. Petr Onderka [[en:User:Svick]] On Wed, Feb 13, 2013 at 6:24 PM, Robert Crowe <robert(a)ourwebhome.com> wrote:

These contain only files. These contain only talk pages. Also, all of them are indirect subcategories of Category:Wikipedia administration. Neither of these might be easy to find out for your, but I think at least one of them should be doable. Just 2500 of them. [1] [1]: http://en.wikipedia.org/wiki/Wikipedia:Dump_reports/Category_cycles Petr Onderka [[en:User:Svick]]

I tried finding all the subcategories of Category:Wikipedia_administration, but unfortunately that includes many non-administration categories also. Will administration categories be limited to those that contain only: - Categories - Files - Talk pages Or are there other defining characteristics? Or are administration categories simply any category that is not a descendent of Category:Articles? Thanks, Robert -----Original Message----- From: Petr Onderka [mailto:gsvick@gmail.com] Sent: Wednesday, February 13, 2013 1:14 PM To: Robert Crowe Cc: xmldatadumps-l(a)lists.wikimedia.org Subject: Re: [Xmldatadumps-l] Housekeeping categories? These contain only files. These contain only talk pages. Also, all of them are indirect subcategories of Category:Wikipedia administration. Neither of these might be easy to find out for your, but I think at least one of them should be doable. Just 2500 of them. [1] [1]: http://en.wikipedia.org/wiki/Wikipedia:Dump_reports/Category_cycles Petr Onderka [[en:User:Svick]]

So if I start at Category:Articles and recurse "downward" into all category members, will it include all pages that are not administration pages? Or do I have to also recurse "upward", keeping in mind that it's a directed graph and not a tree? Thanks, Robert -----Original Message----- From: Federico Leva (Nemo) [mailto:nemowiki@gmail.com] Sent: Saturday, February 23, 2013 1:17 PM To: Robert Crowe Cc: xmldatadumps-l(a)lists.wikimedia.org Subject: Re: [Xmldatadumps-l] Housekeeping categories? Robert Crowe, 23/02/2013 21:58: There are. I doubt there's a precise definition, though. In theory, yes. But the category tree is not even a tree, so all sorts of things can happen... Nemo