> a tool that indents a document without changing its semantics.
> Is there no such tool by definition?

The only way (in general) to  reformat an XML file without changing its
semantics is to add the extra whitespace _inside_ the tags not in
element content.

so
you can change 
<a>bbbb</a>
  to
<a
>bbbb</a
>

which is sometimes useful (James Clark's sp suite tends to use that
style) although not everyone likes the result.

indenting elements (as used for example in xsl:output indent="yes")
will in general change the document, which is why it is not on by
default in xml output (but is for html output).


David

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