Re: rx.el changes

[Richard Stallman]

    As far as I know, Emacs consistently uses capitalized mode and package
    names, which happens to agree with the instructions for messages in
    this case.

A mode has a name in English, which is capitalized.  A few packages
that are not modes also customarily referred to by names that we think
of as English words or acronyms, and we write them following usual the
English conventions; for example, "CL".

However, we never capitalize file names or Lisp symbols.  If those are
capitalized, it is a bug.  We don't have a custom of referring to
rx.el with a name that we treat as a word; we don't refer to it often
enough for that.