The eXtensible Text Framework (XTF) is a powerful open source platform for providing access to digital content. Developed and maintained by the California Digital Library (CDL), XTF functions as the primary access technology for the CDL's digital collections and other digital projects worldwide.
XRay is a free XML editing enviroment. Now in its second major release, XRay provides support for XML Schema (XSD) and an integrated online XML tutorial system.
D. Karger, and D. Quan. Web Semantics: Science, Services and Agents on the World Wide Web, Selcted Papers from the International Semantic Web Conference, 2004 - ISWC, 2004, Hiroshima, Japan, 07-11 November 2004, 3 (2-3):
147-157(October 2005)