XNS is a combination of 5 major components—a naming and addressing service, an XML vocabulary and metavocabulary, an XML protocol and metaprotocol, a legal and operational infrastructure, and a development platform—that together provide a foundation set of services for the next layer of Internet infrastructure. This white paper has compared the key features of XNS with 92 products, services, and standards in 7 general categories and 30 subcategories.