Hello, Continuing the ConTeXt exploration with Hans's help: http://www.mail-archive.com/ntg-context@ntg.nl/msg01784.html I'm trying to combine Hans's JS programming with XML processing but an error pops up: %%%%%%%%%%%%%%% javascript : loading script set fld (/Users/gpl/texmf/tex/context/base/java-fld.tex ! Missing \endcsname inserted. <to be read again> \unhbox \leavevmode ->\unhbox \voidb@x \fakeunderscore ->\leavevmode \hbox {\setbox \scratchbox \hbox {(}\scratchdi... \_...fmmode \mathunderscore \else \textunderscore \fi \XML:ent:tex-underscore ...tterunderscore \else \_ \fi \ascii ->Sanitized\getXMLentity {tex-underscore} TeX\getXMLentity {tex-unders... ... l.115 \stopJSpreamble %%%%%%%%%%%%%%% with the attached TeX file. There's some kind of interaction between the two modes. Without \start(stop)XMLdata, it works. Thanks for your time, Gilles, preparing the next demo of ConTeXt in June (Paris). :-)