Schema attributes

Hi,

I'd like to have information on attributes that are inserted at schema
level.

Are such attributes only virtual components ? I mean are they just added in 
a schema in order to allow other attributes to reference them, or could they
be used in another way ?

Thanks.

--
Michaël Marchegay, Stagiaire France Telecom R&D du 11/02/2002 au 26/07/2002
Sous la responsabilité d'Olivier Dubuisson
DTL/TAL - 22307 Lannion Cedex - France