Following up to myself:
In case you are using git-svn please change into the directory of your
git-svn clone, open the file
.git/config
and find the section named
[svn-remote "svn"]
in there. In the "url=" line of that section please change the
"incubator/ooo" part of the URL to "openoffice".
If you are running into problems with this simple approach please use
the extended instructions for the "General Case" at
https://git.wiki.kernel.org/index.php/GitSvnSwitch
Thanks for the feedback, Oliver-Rainer!
Herbert