Why all the "~/ocular/docdata/..." files?

[joe at actionline.com]

Why is there a bunch of "~/ocular/docdata/.../.xml" files
on my system dating back more than a year?

Many of them have unrecognizable file names, and many incorporate jpg and
pdf file names that do not correspond to any files that I still have on
my local system.

Is there any reason why I should not delete them all?

How can I stop .kde from creating uncountable hundreds of files like this
on my system that I do not want on my system?  Especially .xml files that
seem to be micro$haft garbage.