- replace-header-contents NAME CONTENTS HEADERSprocedure
- replace-header-contents! NAME CONTENTS HEADERSprocedure
- update-header-contents NAME CONTENTS HEADERSprocedure
- update-header-contents! NAME CONTENTS HEADERSprocedure
The replace procedures replace any existing contents of the named header with new ones, the update procedures add these contents to the existing header. The procedures with a name ending in bang are linear update variants of the ones without the bang. The header contents have to be normalized to be a 2-element vector, with the first element being the actual value and the second element being an alist (possibly empty) of parameters/attributes for that value.
The update procedures append the value to the existing header if it is a multi-header, and act as a simple replace in the case of a single-header.