[NTG-context] Accents in MathML

Hello all. I'm processing some Spanish from Unicode and some of it is in MathML, for which I use ConTeXt's native processing. There seems to be a problem with accents. When I run this on Live: -- \mainlanguage[es]\enableregime[utf]\useencoding[uc] \useXMLfilter[utf]\usemodule[mathml] \starttext Maths with accents: \startXMLdata <formula><math><mtext>interés</mtext></math></formula>\stopXMLdata \stoptext -- it fails because of the é (which is an e with an acute accent, in case the mail system turns it into gobbledgook). Can anyone help? Thanks. Duncan