Edd Dumbill
discusses
Ted Nelson's XML is Evil essay on O'Reilly.
"Nelson's article argues that inline markup, such as SGML and XML, is problematic. His alternative model comprises three layers: content, structure, and presentation. This is not coincidentally the model used by Xanadu, the hypertext system designed by Nelson and others. Xanadu's hypertext model is a closed world, where links never break, supporting copyright and version-management features. It sounds ideal. It is also widely unimplemented."
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