Dear Friends, I spent some time searching and coding simple documents, but failed and therefore I'm asking for help... A section such as chapter cn have custom keys with values. One uses the: \structureuservariable command to access such values. How can I use such a value to create a custom header in a format: Prefix: \structureuservariable{foo} I am asking for the only thing that worked when I tried was calling the: \setupheadertexts command inside a chapter environment block with some prefix. Unfortunately the value from the custom field was not expanded. It was correctly inserted in a regular paragraph. For example: \startchapter [title={A sample title}][custom_something={random_value}] ... \stopchapter How can I put the value of: custom_something in the header with some prefix? All the best and thanks, Pawel