Dear Pablo, Thank you for your insightful remarks. I tried your suggestions. As you predicted, the Knuth tex is processed when put here, without using the buffer mechanism. \startsetups[letter:section:content] \input knuth \relax \stopsetups Yet any codes (\TeX\) are not. Nevertheless, I consider this a step forward. In the same way, my letter texts, which contain regular codes, such as \startitemize … \stopitemize and {\bf bold} are not processed properly. The whole thing is much more complicated than I thought. Wolfgang already mentioned that the letter module is not specifically equipped for xml. Would it be wise to perhaps follow the path set out by Thomas? In that case there should be a way to shift the address. Regards, Robert