Constant instances in XML schema ?

I'm looking for a way to specify complex constants in XML schema, similar to 
static instance in Java classes : Color class allows to create any color, but 
comes also with a bunch of predefined static color instances.
Is there anything available in XML schema for this ? Entities seems to be 
more adapted for text fragment than full elements, but i could be wrong.
-- 
Guillaume Rousse <rousse@ccr.jussieu.fr>
GPG key http://lis.snv.jussieu.fr/~rousse/gpgkey.html

Received on Monday, 24 September 2001 09:00:05 UTC