[NTG-context] XML, units and mu

Hello, Please check out this example: \usemodule[newpml] \usetypescript[modern-base][texnansi] \setupbodyfont[12pt,modern] \starttext This `mu' looks good: 250\,\textmu{}l\par \startXMLdata <iphys><mtext>This `mu' doesn't: </mtext><apply><unit/><mn>250</mn><msymbol><Micro/><Liter/></msymbol></apply></iphys> \stopXMLdata \stoptext How can I stop the units mu from being italic? Thanks, Joh