[Info-vax] VAX object and executable file formats documented?

[Galen]

Are the formats used by VMS for .obj and .exe files documented somewhere?

A long time ago I wouldn't have needed to ask this question, but it's been a very long time since I worked at that level with these files, and I haven't had access to a grey wall (or white, if perfect bound) in 13 years. 

Simple Google searches, including in comp.os.vms, haven't turned up anything, but I haven't looked at more than a few screens worth of results. Too many useless hits.

(Just reminiscing--I know that on RSX-11M, even longer ago, I had documentation of the equivalent files for that OS, but I don't remember if that was something that came with the docs, something I brought back from the RSX internals courses, or something from DECUS.)