v 1.3.1
XML/SGML editing mode for emacs
Emacs is an advanced and extensible editor. A Major Mode customizes Emacs for editing text of a particular sort. PSGML is a major mode for SGML documents. PSGML has several functions for editing SGML documents. Indentation according to element nesting depth and identification of structural errors (but it is not a validating SGML parser). Menus and commands for inserting tags with only the contextually valid tags. Attribute values can be edited in a separate window with information about types and defaults. Structure based editing includes movement and killing; and also several commands for folding editing.
http://www.lysator.liu.se/projects/about_psgml.html
To install psgml, paste this into the macOS Terminal after installing MacPorts
sudo port install psgml
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