It looks like the page was deleted/restored thus giving it a new page ID.
Originally when pages where deleted the page_id was not kept, which caused
a new page_id to be issued when it was restored. This phenomenon has since
been fixed, and should no longer happen.

On Sat, Dec 3, 2016 at 8:47 AM, Renato Stoffalette Joao <j...@l3s.de> wrote:

> Hi all.
>
> Firstly, apologies for eventual duplicates or posting the question in the
> wrong mailing  list.
>
> Secondly, could anybody kindly explain to me if some Wikipedia pages
> changed their IDs from the past ? Or if so point to me where this might be
> documented ?
> I have Wikipedia pages-articles  XML dumps from the years 2006 and 2008
> and  when I was parsing those dumps I ran across some situations
> such as the following one. In the dumps from 2006 and 2008 I found that
> the South Africa page has the ID 68854, while in the most current Wikipedia
> pages-articles XML dump (i.e. 2016) the same article has the ID  17416221.
> I am trying to match some Wiki pages by IDs across time, but the example
> above is not helping.
>
> Much appreciated in advance for any help.
>
> --
> Renato Stoffalette Joao
> - PhD Student -
> L3S Research Center / Leibniz Uni.
> 15th Floor, Room:1519
> Appelstraße 9a
> 30167 Hannover, Germany
> +49.511.762-17759
>
>
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>
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