To move the documentation in a noarch package
I split lilypond in two source packages.

http://matzeri.altervista.org/noarch/lilypond-doc/
http://matzeri.altervista.org/x86/lilypond/
http://matzeri.altervista.org/x86_64/lilypond/

The documentation is just a copy of the upstream PDF so :
- the source package is a dummy to avoid data duplication
- the install phase phase grab the files from upstream an put in
the proper directory.

Question:
- How to properly replace the old layout with the
  new in upload ?

I expect that "calm" could complain about:

x86/release/lilypond/lilypond-doc/lilypond-doc-2.19.37-1.tar.xz
noarch/release/lilypond-doc/lilypond-doc-2.19.42-1.tar.xz

Should I move both as :

noarch/release/lilypond-doc/lilypond-doc-2.19.37-1.tar.xz
noarch/release/lilypond-doc/lilypond-doc-2.19.42-1.tar.xz

Regards
Marco