For categories, list=backlinks&blnamespace=14 returns the categories that *link to* the specified page -- that is, categories whose *descriptions* link to that page -- whereas prop=categories returns the categories that *contain *the specified page. These are two distinct relationships.
For portals, the software has no built-in notion of a portal "containing" a page, but you've defined it this way: > The <links> element contains <pl> items in namespaces 0 (articles), 14 (categories), and 100 (portals). I interpret that as "Portal:Novels contains these items", meaning that in tree terms it is the parent of those items, or that those items "belong to Portal:Novels". That is, by your definition, "portal X *links to* page Y" and "portal X * contains* page Y" are the same relationship. So list=backlinks&blnamespace=100 (which returns the portal pages that *link to * the specified page) is equivalent to your hypothetical prop=portals (which would return the portal pages that *contain* the specified page). Does that make sense? -Ran Ari-Gur (user "Ruakh" on WMF projects) On Sun, Mar 20, 2011 at 1:42 PM, Robert Crowe <rob...@ourwebhome.com> wrote: > I'm sorry, I didn't mean to criticize. What I was trying to do is to > validate that list=backlinks and prop=categories are querying for the same > relationship if the backlinks namespace is set for categories, using > blnamespace=14. If they were two ways to query for the same relationship > between pages, then the results should be the same, but they are not. > > I've been able to verify that prop=categories returns the correct > relationship, because the inverse (list=categorymembers) returns the inverse > result. If prop=categories indicates that A is a parent of B, then > list=categorymembers correctly indicates that B is a child of A. > > So what I'm trying to do is find the same relationship for portal pages > (namespace=100). list=categorymembers also correctly returns the children > who are portals, but I don't know how to find the parents that are portals. > > Thanks in advance, > > Robert > > -----Original Message----- > From: Andre Engels [mailto:andreeng...@gmail.com] > Sent: Sunday, March 20, 2011 10:15 AM > To: Robert Crowe > Cc: MediaWiki API announcements & discussion > Subject: Re: [Mediawiki-api] Portals vs categories > > On Sun, Mar 20, 2011 at 5:43 PM, Robert Crowe <rob...@ourwebhome.com> > wrote: > > Thanks André, but after testing it seems that backlinks returns something > else. For example this query: > > > > > http://en.wikipedia.org/w/api.php?action=query&titles=Category:Voltaire&prop=categories > > > > Returns: > > > > <query> > > <pages> > > <page pageid="3465227" ns="14" title="Category:Voltaire"> > > <categories> > > <cl ns="14" title="Category:Categories named after French > people" /> > > <cl ns="14" title="Category:Categories named after philosophers" > /> > > <cl ns="14" title="Category:Categories named after writers" /> > > </categories> > > </page> > > </pages> > > </query> > > > > But this query: > > > > > http://en.wikipedia.org/w/api.php?action=query&list=backlinks&bltitle=Category:Voltaire&blnamespace=14&bllimit=500 > > > > Returns: > > > > <query> > > <backlinks /> > > </query> > > > > If I just use "Voltaire" instead of "Category:Voltaire" then I think it's > looking at a different page, right? The results are different, and don't > match the first query results: > > > > <query> > > <backlinks> > > <bl pageid="3465227" ns="14" title="Category:Voltaire" /> > > <bl pageid="15582893" ns="14" title="Category:Novels by Voltaire" /> > > </backlinks> > > </query> > > You criticize my request because another request does not give the > same result as a third request... I understand less and less of what > you are trying to do. > > -- > André Engels, andreeng...@gmail.com > > > _______________________________________________ > Mediawiki-api mailing list > Mediawiki-api@lists.wikimedia.org > https://lists.wikimedia.org/mailman/listinfo/mediawiki-api >
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