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Either install TEI Emacs as described earlier or download psgml mode from http://www.lysator.liu.se/projects/about_psgml.html and follow the installation instructions there.

From

Cover of Learning GNU Emacs, 3rd Edition

Note

TEST PROCEDURE: Use melpa package archives to install. M-x list-packages

INSTALL: add this two lines to your .emacs FILE (autoload 'sgml-mode "psgml" "Major mode to edit SGML files." t) (autoload 'xml-mode "psgml" "Major mode to edit XML files." t)

First run M-x sgml-mode, then M-x xml-mode