DocBook - trouble with 'em' unit

hello,

i have this message from the jfor processor "can't convert to the 'em'
unit" when i apply a fo file result from the transformation of a docbook
XML file and the XSL's Norman Walsh for fo output. I don't have the problem
with FOP and with XFC (XML Mind processor for RTF). Does anyone know an
easy way to resolve it ? One way could be to change the XSL file with unit
"pt" but it's a little labored isn't it ?

thanks for your help

stefan



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