Perhaps an analogy would explain the value-add.
I've always considered HTTP and URIs as basically a means for making
the Internet look like a relational database, with XML as a database
export format, and RDF as a standardized schema where all tables (with
URIs for names) have three columns labeled "subject", "predicate", and
"object".
So the value add of RDF/XML over vanilla XML is the same as the value
add of having a standardized database schema over the alternative of
not having one.
Mark.
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Mark Baker. Ottawa, Ontario, CANADA. http://www.markbaker.ca
