From mboxrd@z Thu Jan  1 00:00:00 1970
From: Eric Abrahamsen <eric@ericabrahamsen.net>
Subject: Re: DTD prohibited
Date: Wed, 04 Jun 2014 17:04:14 +0800
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Eric S Fraga <e.fraga@ucl.ac.uk> writes:

> On Tuesday,  3 Jun 2014 at 22:14, AW wrote:
>
> [...]
>
>> Hi, 
>>
>> thank you, I started again digging into this strange thing and the culprit 
>> seems the first line of the html-file:
>>
>> <?xml version="1.0" encoding="utf-8"?>
>>
>> If I remove this line, no error.  And removing simply 
>
> Have a look at 
>
> ,----[ C-h v org-html-xml-declaration RET ]
> | org-html-xml-declaration is a variable defined in `ox-html.el'.
> | Its value is
> | (("html" . "<?xml version=\"1.0\" encoding=\"%s\"?>")
> |  ("php" . "<?php echo \"<?xml version=\\\"1.0\\\" encoding=\\\"%s\\\" ?>\"; ?>"))
> | 
> | 
> | Documentation:
> | The extension for exported HTML files.
> | %s will be replaced with the charset of the exported file.
> | This may be a string, or an alist with export extensions
> | and corresponding declarations.
> | 
> | This declaration only applies when exporting to XHTML.
> | 
> | You can customize this variable.
> | 
> | [back]

Seems like simply exporting as html5 might solve the problem.