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+-*- mode: outline; coding: utf-8 -*-
+
+* xml.
+
+** tidy.
+
+  $ tidy -xml -i -utf8 -o out.xml in.xml
+
+or in Emacs C-x h C-x <RET> c utf-8 <RET> C-u M-| tidy -q -xml -i -utf8 -
+
+  http://tidy.sourceforge.net
+                home page
+  http://www.emacswiki.org/cgi-bin/wiki/tidy.el
+
+** xmllint.
+
+  $ xmllint --format file.xml
+
+or in Emacs: C-x h C-u M-| xmllint --format - <RET>
+
+** Emacs and nxml.
+
+You need introduce line-breaks and then C-x h C-M-\.
+
+** xmlindent.
+
+  http://xmlindent.sourceforge.net/
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