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(psgml.info)Indent

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Enter node , (file) or (file)node

Indentation according to structure
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   You can indent a line according to the depth of element nesting at
the beginning of the line.  To indent the current line use `<TAB>'.
You can also use `<LFD>' (`newline-and-indent') to start a new line
with correct indentation.

 - User Option: sgml-indent-step
     How much to increment indent for every element level.  If nil, no
     indentation.

     If this is nil, `<TAB>' will insert a tab instead of indenting.

 - User Option: sgml-indent-data
     If non-nil, indent in data/mixed context also.