Re: <attribute name="xmlns"/>

> Can we also disallow xmlns:a, xmlns:b, ....?  These are attribute
> information items  of the namespace "http://www.w3.org/2000/xmlns/"

xmlns:a is already disallowed by virtue of the fact that prefixes must have 
a declaration in the context.  XML Namespaces disallows xmlns:xmlns="..." 
(albeit not very clearly: it "reserves" names beginning with "xml" in any 
case) so there is no way that there can be a declaration of the prefix 
"xmlns" in the context.

James