An XML application for pages at the end of a namespace URI.
Invented by Jonathan Borden, Tim Bray, and others on the xml-dev mailing list
A Resource Directory provides a text description of some class of resources and of other resources related to that class. It also contains a directory of links to these related resources.
An XML namespace is one possible kind of resource. Related resources might include schemas, stylesheets, Java content handlers, browser plug-ins, and more.
The RDDL DTD is an extension of XHTML Basic 1.0 using XHTML Modularization.
RDDL adds one new element to XHTML Basic 1.0: resource.