From mboxrd@z Thu Jan  1 00:00:00 1970
From: Jambunathan K <kjambunathan@gmail.com>
Subject: bug#15840: libxml-parse-xml-region: Raise runtime error, don't
 return nil
Date: Sat, 09 Nov 2013 17:23:16 +0530
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	(Christof Spitz's message of "Sat, 9 Nov 2013 08:44:32 +0100")
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Christof Spitz <christof.spitz@gmail.com> writes:

> Emacs did return a runtime error

This is what Emacs does.  

>From xml.c: 96
	  message1 ("libxml2 library not found");

and message1 (based on other uses elsewhere) seems to be used for
ordinary echo area messages (like prompt strings etc) as opposed to an
"error" message.

----------------------------------------------------------------

It is easy to check though.

I don't have access to a Windows machine.  It should really be an error
and not a simple informative message.  Try this:

1. Remove libxml
2. M-x toggle-debug-on-error RET
3. Export to freemind

Do you now get a backtrace buffer?