RNG and XSD Updated to Correct Subject Scheme URIs

[Eliot Kimber <ekimber@contrext.com>]

Radu Coravu discovered that the URIs used for the subject scheme and
classify shells and modules did not match the 1.2 versions--they were
missing the "spec:classification:" component used in 1.2.

I've corrected the catalogs, references, and URIs defined in the RNG files
(from which the catalogs were originally generated) to match the 1.2
values.

I also made all the URIs for all the different format versions of the
Subject Scheme shells and modules consistent so that they all include
"spec:classification:".

This change would affect you only if you have an XSD shell for Subject
Scheme map that used the incorrect URI to point to the
subject-scheme-specific files.

No formats other than the XSD are affected and the only change to the RNG
is in metadata used for catalog generation.

Cheers,

E.

----
Eliot Kimber, Owner
Contrext, LLC
http://contrext.com