Hi for all of you who want to compile documents with context under MK IV you can use luatools --make --compile cont-xx to compile your language, hereby you must replace xx by the country-code of your desired language and with luatools --run cont-xx myfile you can compile your document. If you are using the chemic-modul you should add the following to your preamble to let it compile correctly: \unprotect \def\MPdivten[#1]% {\@EA\@EA\@EA\doMPdivten\@EA\@EA\@EA[\@EA#1]} \def\doMPdivten[#1]% {\ifnum#1> 9999 \dodoMPdivtenB#1\else \ifnum#1> 999 \dodoMPdivtenC#1\else \ifnum#1> 99 \dodoMPdivtenD#1\else \ifnum#1> 9 \dodoMPdivtenE#1\else \ifnum#1> 0 \dodoMPdivtenF#1\else \ifnum#1<-9999 \dodoMPdivtenA#1\else \ifnum#1< -999 \dodoMPdivtenB#1\else \ifnum#1< -99 \dodoMPdivtenC#1\else \ifnum#1< -9 \dodoMPdivtenD#1\else \ifnum#1< 0 \dodoMPdivtenE#1\else 0 \fi\fi\fi\fi\fi\fi\fi\fi\fi\fi} \def\dodoMPdivtenA#1#2#3#4#5#6{#1#2#3#4#5.#6} \def\dodoMPdivtenB #1#2#3#4#5{#1#2#3#4.#5} \def\dodoMPdivtenC #1#2#3#4{#1#2#3.#4} \def\dodoMPdivtenD #1#2#3{#1#2.#3} \def\dodoMPdivtenE #1#2{#1.#2} \def\dodoMPdivtenF #1{.#1} \protect Thanks here to Wolfgang Schuster you just helped to figure out this howto. The question is now how could one give the language-option over to context by the context command or by edit the sourcefile with a command so that the command has the following input: context myfile with the language-option in a context-command in the source-file or like context --lang=de myfile where the --lang option refers to the above luatools option so that default luatools --run cont-en myfile is invoken and if --lang=xx is set the command is invoken in the following way luatools --run cont-xx myfile. Would be nice if one of the programmers could just implement the following option in MK IV. Greetings Martin