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/usr/share/doc/smartdoc-elisp/README.Debian is in smartdoc-elisp 1.0-5.

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Unfortunely, sdoc-mode conflict to sgml-mode(psgml).
Then, auto-mode-alist NOT be set in Debian default.

You can add this your ~/.emacs for entering sdoc-mode automatically
when opening *.sdoc file.
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(setq auto-mode-alist
    (append '(("\\.sdoc$" . sdoc-mode)) auto-mode-alist))
(setq sgml-quick-keys t)
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