Sigbert,
One approach you could consider is to _package_ the data in a (standard R)
package upon which you can have a Suggests: relationship using a
Additional_repositories: entry in DESCRIPTION. That is fully compliant and
compatible with the CRAN Policy, and has been done before -- in fact there is
a detailed writeup for just this case ("additional data packages") here in
the 9:1 issue of the R Journal.
https://journal.r-project.org/archive/2017/RJ-2017-026/index.html
The paper details how to use the drat package to manage that repository but
it is worth stressing that drat is entirely optional -- everything can be
done the same way with base R functions.
Dirk
--
http://dirk.eddelbuettel.com | @eddelbuettel | e...@debian.org
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