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Subject: Re: How to save invisible (lisp) data in a text file
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Many thanks for the answers!

I had a look at enriched.el and ses.el.
I will use the method I described but, instead of 
deleting the lines concerning the file-local variables, 
I will just hide them using facemenu-set-invisible.

BTW, facemenu-set-invisible is NOT in the emacs command index:
https://www.gnu.org/software/emacs/manual/html_node/emacs/Command-Index.html

Is it a bug?