How to fill extension updater fields?

At the moment, I’m trying to figure out, which parameters do need to be filled to get the fields “description” and the “more Information” field for the Extension Updater Dialog filled.

I was even reading the original spec, but the funny part is, even there in OOo 2.2 (?) the fields are empty.

In our documentation at the wiki doesn’t mention these fields. I tried some stuff, used search engines and the like, but didn’t figure out how to fill these fields (using links to UTF8-text-files and even simply providing text in xml-tags).

Can these fields be populated? And iff not, why do they exist?

I 'm not sure, in Ooo seems that the field release notes can be fill with

<release-notes>
    <src xlink:href="http://extensions.openoffice.org/testarea/desktop/publisher/release-notes_de.txt" lang="de" />
    <src xlink:href="http://extensions.openoffice.org/testarea/desktop/publisher/release-notes_en.txt" lang="en" />
  </release-notes>

: Example - Apache OpenOffice Wiki

I did try add the release-notes-tag in the extension.update.xml-file on my webspace.
The link in the release-notes-tag will be added to the field “Was ist neu:” (aka “What is new:”).

I also tried to use the xml-tags extension-description and update-description and update-information as I found them party in the code (c.f. https://opengrok.libreoffice.org/xref/core/desktop/source/deployment/misc/dp_descriptioninfoset.cxx?mo=21446&fi=607#671 ).

Sadly no luck. More hints are welcomed.