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A simple system plugin that will check the HTTP_ACCEPT headers to see if the browser supports the application/xhtml+xml MIME type, and if so, sets the Content-Type header accordingly. Since IE doesn't recognise this MIME type, the plugin is useful only where you want to make use of XHTML-based technologies (e.g. XForms, SVG, MathML) for a limited (or controlled) set of users.