Are meta-commands case-sensitive?

[Alex Taylor]

Almost all official and unofficial meta-commands that I've seen are written in all-caps (the exceptions being 'Name' and 'Author', presumably for historical reasons). I can't find anything which specifies that this is mandatory when defining new metas, so does anyone know:

- is it in fact mandatory, or just convention?
- should parsers be case-sensitive or case-insensitive when dealing with metas?


(As an aside, 'meta' is not an acronym, so should not be written as 'META' as it seems to be throughout the specs...)