Attributes and extension

Dear All,

In case of an extension can we redefine an attribute in order to 
change its use or default value ?

In the proposed recommendations :

Constraint on Schemas: Derivation Valid (Extension) 
If the {derivation method} is extension: 
1.1 If the {base type definition} is a complex type definition: 
  1.1.1 The {final} of the {base type definition} must not contain 
        extension 
  1.1.2 
             Its {attribute use pairs} must be a subset of the 
             {attribute use pairs} of the complex type definition 
             itself, that is, for every attribute use pair in the 
             {attribute use pairs} of the {base type definition}, 
             there must be a pair in the {attribute use pairs} of 
             the complex type definition itself whose attribute 
             declaration has the same {name}, {target namespace} and 
             {type definition} as its attribute declaration; 

		^^^^^^^^^^^ does it mean that we can change its 
               use and default value ?

Thank you very much.

Best regards,
Claude.

-- 
______________________________________________

Claude Seyrat

Expway c/o Acland
18 avenue Georges V
75008 Paris
tel: 33 1 56 62 11 05
fax: 33 1 56 62 11 11
mail: cseyrat@acland.fr