Numerous articles about XML, including many on the DocBook DTD for documents.
This W3C discussion paper outlines the differences between SGML and XML.
Ten key points explaining the rationale of the language.
David C. Hay's discusses HTML and its counterpart, what it can and cannot do.
Now unmaintained list of ideas and simple tools from the early days.
This irt.org article presents a brief overview of XML, including its background, applications, and future. (Janus Boye)
A White paper by Jon Bosak of Sun Microsystems.
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