> As far as sequence goes, there is an ISO standard method "Formal System
> Identifiers" (FSIs). If people want them, they can be retrofitted on top
> of URLs.
But they can't be used in "system identifier" slots in XML without
changing XML 1.0, because XML 1.0 system ids are URI references
and nothing else.
-- 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)