Multi-Language Conventions ?

[eluser]Buso[/eluser]
the guide you posted recommends to use iso 639-3, and links to: http://www.sil.org/iso639-3/codes.asp

if you go to 's' looking for Spanish, you will find this: http://www.sil.org/iso639-3/codes.asp?or...3&letter=s

There you have:
639-3: spa
639-2: spa
639-1: es

So I understand that they have changed the code from 'es' to 'spa'.

Most of my browsers are sending 'es' now, but maybe in future versions they move to 'spa' ?

I don't see what's the point of this convention anyway, it's not like users had to deal with these codes.. They should have used integer identifiers instead =P