Score File Syntax A Programmers Guide to Gnus Ranges

10.5.4: Headers

Internally Gnus uses a format for storing article headers that corresponds to the NOV format in a mysterious fashion. One could almost suspect that the author looked at the NOV specification and just shamelessly stole the entire thing, and one would be right.

Header is a severely overloaded term. ``Header'' is used in RFC1036 to talk about lines in the head of an article (e.g., From). It is used by many people as a synonym for ``head''---``the header and the body''. (That should be avoided, in my opinion.) And Gnus uses a format internally that it calls ``header'', which is what I'm talking about here. This is a 9-element vector, basically, with each header (ouch) having one slot.

These slots are, in order: number, subject, from, date, id, references, chars, lines, xref. There are macros for accessing and setting these slots---they all have predictable names beginning with mail-header- and mail-header-set-, respectively.

The xref slot is really a misc slot. Any extra info will be put in there.

Score File Syntax

A Programmers Guide to Gnus

Ranges