I was just reading through http://www.w3.org/TR/xhtml-media-types/ which currently points to http://www.w3.org/TR/2002/NOTE-xhtml-media-types-20020430 and came across http://www.w3.org/TR/xhtml-media-types/#summary-table That tabe indicates that XHTML 1.1 files should be either a) application/xhtml+xml b) application/xml c) text/xml (with "a" being preferred) and *should not* be sent as text/html Now it doesn't go as far as saying 'must not' but it doesn't say 'May' either. Wouldn't this confuse older browsers (who aren't going to know enough to display application/xhtml+xml) ? TjL, who should probably be asking this on the W3 list but who hopes someone here will know enough to speak about it