The new sgml-mode.el in Emacs (ie. not PsgmlMode) also does very simple indenting.
Here is a link to the latest copy:
Put it in your LoadPath and load it in your ~/.emacs:
(require 'sgml-mode)
Take a simple example file:
<book>
<home>test</home>
</book>Put point on the second line and hit ‘M-x sgml-indent-line’. The result should be the following:
<book>
<home>test</home>
</book>If you are looking for a familiar IDE tab and auto-indent setup, where TAB always puts a tab, and pressing enter indents to align with the previous line, this is what to put in your ~/.emacs:
(add-hook 'sgml-mode-hook
(function (lambda()
(define-key
sgml-mode-map
(kbd "<tab>")
(lambda () (interactive) (insert "\t")))
(define-key
sgml-mode-map
(kbd "RET") 'newline-and-indent)
)))