[whatwg] legacy charset support for XML

[Křištof Želechovski]

The sniffing draft
<http://webblaze.cs.berkeley.edu/2009/mime-sniff/mime-sniff.txt> in
sufficiently prescribes what happens if MIME content type is specified as
text/xml; charset=ISO-8859-2.  MSIE 7 refuses to render documents like
<http://www.kobiko.com.pl/pub/hello.xml> unless the encoding is specified in
the XML prolog.  Would that be compliant?
Best regards,
Chris