Unless I did not understand something, this is by design - you have asked for multiple properties - categories, revision, and imageinfo. The first result included everything except all imageinfos (which is strange - imageinfo doesn't seem so complex as to require a continuation, but that's a separate potential issue). When you continued, the second result will only give you what you have not received yet - which is only the imageinfo. There is no point to resend the same revision data twice.


On Tue, May 28, 2013 at 2:29 PM, Liu Chenheng <liuchenheng@gmail.com> wrote:
Hi, All!

I found a very strange thing about the continue tokens:

The link is here:
http://commons.wikimedia.org/w/api.php?action=query&format=xml&revids=37692183&cllimit=max&iiprop=bitdepth%7Cdimensions%7Cmime%7Csha1%7Csize%7Curl&prop=categories%7Cimageinfo%7Cinfo%7Crevisions&rvprop=comment%7Ccontent%7Cflags%7Cids%7Ctimestamp%7Cuser&continue=

I got the following response:

<api>
<query>
<pages>
<page pageid="1246719" ns="6" title="File:AB towns+names.png" imagerepository="local" contentmodel="wikitext" touched="2012-04-26T19:25:33Z" lastrevid="37692183" counter="" length="447">
<categories>
<cl ns="14" title="Category:Locator maps of cities in Alberta"/>
<cl ns="14" title="Category:Maps of Alberta"/>
<cl ns="14" title="Category:PD-self"/>
</categories>
<imageinfo>
<ii size="82937" width="524" height="700" url="http://upload.wikimedia.org/wikipedia/commons/1/1d/AB_towns%2Bnames.png"descriptionurl="http://commons.wikimedia.org/wiki/File:AB_towns%2Bnames.png" sha1="0753be62082948bceb1db4205e75d4cf819dbbfa"mime="image/png" bitdepth="8"/>
</imageinfo>
<revisions>
<rev revid="37692183" parentid="25300971" minor="" user="Qyd" timestamp="2010-04-16T02:38:20Z" comment="/* {{int:filedesc}} */ gallery" contentformat="text/x-wiki" contentmodel="wikitext" xml:space="preserve">
== {{int:filedesc}} == {{Information |Description=Map of [[Alberta]] with cities, towns and roads |Source=GIS data |Date=2006-10 |Author={{User|Qyd}} |Permission=All |other_versions=<gallery> Image:AB-towns-roads.png|without town names Image:AB-towns-highways.png|simplified Image:AB-cities-roads.png|cities and highways </gallery> }} [[Category:Maps of Alberta]] [[Category:Locator maps of cities in Alberta|*]] == {{int:license}} == {{PD-self}}
</rev>
</revisions>
</page>
</pages>
</query>
<limits categories="500"/>
<continue continue="||categories|info|revisions" iistart="2006-10-05T10:33:30Z"/>
</api>

I found there was a continue token at the end of the response, Then I use:

to get the following response:

<api>
<limits categories="500"/>
<query>
<pages>
<page pageid="1246719" ns="6" title="File:AB towns+names.png" imagerepository="local">
<imageinfo>
<ii size="76966" width="524" height="700"url="http://upload.wikimedia.org/wikipedia/commons/archive/1/1d/20061006020043%21AB_towns%2Bnames.png"descriptionurl="http://commons.wikimedia.org/wiki/File:AB_towns%2Bnames.png" sha1="387284aaeea43dfae091e965e19cc47ce99dcf49"mime="image/png" bitdepth="8"/>
</imageinfo>
</page>
</pages>
</query>
<continue continue="||categories|info|revisions" iistart="2006-10-04T23:32:38Z"/>
</api>

I found in the response we didn't have the revisions information any more.

I think this may be a bug? Because I found if we set clcontinue to request the following page, the response will not miss the revisions information.

P.S. Another question: Are the items in imageinfo list sorted by timestamp? I mean from latest to oldest.

Thanks.

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