Accents inside comments

 When I try to write any of these letters: 'ó', 'ú' or 'ñ' (and maybe
more I haven't tested) inside a comment in XSL I get a
SAXParseException: 'An invalid XML character was found in the document'.

 Is this a problem of the processor I'm using (Xalan 1.2), or are these
characters simply not allowed (even inside comments)?

 Thank you.

//Ruben



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