From: SRU (Search and Retrieve Via URL) Implementors [mailto:[log in to unmask]] On
Behalf Of Dr R. Sanderson
>how would you have the schema in the explain information in such a way as
to make it clear it was a metadata schema for use with the extension, not a
regular schema? 

Assign an additional identifier for a schema that can be used in both roles.
E.g. two URIs for marcxml. One for it's "regular" use and a second for it's
use as record metadata.
--Ray