SGML and XML are formal metalanguage facilities for defining markup languages. SGML has the full power to configure a set of features for markup languages, whereas XML has a fixed set of these SGML features. Since XML is a profile of SGML (rather like a p
This Thinking XML column shows how to combine metadata collected from multiple XML source documents into a single Resource Description Framework (RDF) model for effective querying. In this follow-up to his previous installment that introduced how to use X