> They are formally defined
> in ISO 8879 (the SGML standard) and in ISO 9070, which defines various
> registration authorities for public IDs (of which the ISBN is one).
Tell me then, if you will, oh mighty oracle :-), what the rules are
for non-formal public identifiers? I think I now grasp FPIs.
-- John Cowan http://www.ccil.org/~cowan cowan@ccil.org You tollerday donsk? N. You tolkatiff scowegian? Nn. You spigotty anglease? Nnn. You phonio saxo? Nnnn. Clear all so! 'Tis a Jute.... (Finnegans Wake 16.5)