prop=pageprops formerly added all the page properties to the page node. For example, <page pageid="25970423" ns="0" title="IPad" defaultsort="Ipad" displaytitle="iPad">

In bug 27479,[1] it was pointed out this can cause API errors if the name of a page property conflicts with a property or node generated by another module; for example, both prop=info&inprop=displaytitle and prop=pageprops will try to add displaytitle to the page node.

In r82312[2] the output of pageprops was changed to place the properties on a subnode named "pageprops" to avoid such conflicts, in much the same way that prop=categoryinfo works. For example, <page pageid="25970423" ns="0" title="IPad"> <pageprops defaultsort="Ipad" displaytitle="iPad" /> </page>

This is tagged for backporting to 1.17 and 1.17wmf1, although I couldn't say when that might be done.

[1] https://bugzilla.wikimedia.org/show_bug.cgi?id=27479 [2] http://www.mediawiki.org/wiki/Special:Code/MediaWiki/82312