[Issue] Identity Constraints, are they accessible from Schema itself??

References,

[1] http://lists.w3.org/Archives/Member/w3c-xml-schema-ig/2002Oct/0222.html
(member only)

<quote>
(3) Identity constraints accessibility in component graph
     While identity constraints are available through the element to which
     they are bound, as named members in their own symbol space, it would
     be beneficial to have them directly available at the top level, i.e.
from
     a property on the schema-as-a-whole schema component.
</quote>

Mary raised this issue on Oct 18th.

Asir