These are files for storing form data outside of the pdf.  You can see it
stores all sorts of wonderful things like where you were last in the
document.  Oh, and if you're using a pdf to fill out your taxes, all that
would be in there too.  You can view one of the many bugs opened against it
here as people lose their minds over this abomination.
https://bugs.launchpad.net/ubuntu/+source/kdegraphics/+bug/521533
and if you're really bored, you can read the open okular bug to remove at
least the form-fill data from it.
https://bugs.kde.org/show_bug.cgi?id=267350
Currently you'd have to break okular or use something besides it to avoid
from what I can see.

On Tue, Jul 11, 2017 at 12:06 PM, <joe@actionline.com> wrote:

> Can someone please tell me why 'okular' saves a
> file like the example below every time it is used?
>
> Is there any good reason why all these hundreds
> of nuisance files should not be deleted? I've
> deleted a few and it has no affect on opening
> another copy of the example .pdf file.
>
> What (if anything) is the purpose for okular
> to create all these nuisance files to clutter
> up my file system? And is there some way to
> put a stop to it?
>
> The same seems to be true for an unknown number
> of other programs that create thousands of what
> seem to be nuisance, space-wasting files that I
> keep finding on my system.
>
>
> ~/.kde/share/apps/okular/docdata/239422.edge.pdf.xml
>
> CONTENTS:
>
> <?xml version="1.0" encoding="utf-8"?>
> <!DOCTYPE documentInfo>
> <documentInfo
> url="/home/joe/.kde/share/apps/okular/docdata/239422.edge.pdf.xml">
>  <pageList/>
>  <generalInfo>
>   <history>
>    <current viewport="0;C2:0.499582:0.304825:1"/>
>   </history>
>   <views>
>    <view name="PageView">
>     <zoom mode="1" value="1.995"/>
>    </view>
>   </views>
>  </generalInfo>
> </documentInfo>
>
>
>
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-- 
James McPhee
jmcphe@gmail.com