just strings, code using them is yet to be implemented

Change-Id: I03b2c44f574b3212b39bf4aabedf01c577f35de9
Reviewed-on: https://gerrit.libreoffice.org/45156Reviewed-by: Siegmund Gorr <siegmund.gorr@cib.de>
Reviewed-by: Thorsten Behrens <Thorsten.Behrens@CIB.de>
Tested-by: Thorsten Behrens <Thorsten.Behrens@CIB.de>