xml-dev - Public Identifiers

[Leigh Dodds <ldodds@ingenta.com>]

Is it legal to define my own Public Identifiers for document types?

I'm assuming it is, given that the first section of the identifier 
allows me to indicate whether I'm a 'registered owner' or not
(i.e. +//... versus -//...)

I'm just curious as to whether its good practice to define Public 
Identifiers, and whether I should be considering registration or not 
(and what that might involve).

Cheers,

L.

-- 
Leigh Dodds, Systems Architect       | "Pluralitas non est ponenda
http://weblogs.userland.com/eclectic |    sine necessitate"
http://www.xml.com/pub/xmldeviant    |     -- William of Ockham