Extending Validators

HTML validators are essential tools for eliminating embedded syntactical errors in HTML documents that can cause client-side software errors. But HTML validators are also extensible tools that can be adapted to serve a variety of other useful functions, as well. The systematic use of an HTML validator, coupled with a 'house style' DTD, can simplify immensely the task of creating a consistent repository of hypertext-based corporate information.

Sullivan, Terry. All Things Web (1997). Design>Web Design>SGML

VRML: Three Dimensions for the World Wide Web  

The Virtual Reality Modeling Language (VRML) is a standard for describing three-dimensional, virtual scenes and environments that can be served via the World Wide Web. A rapidly emerging communication medium, VRML may soon become a technology used by technical communicators in many industries where 30 information truly enhances a message.

Ames, Andrea L. STC Proceedings (1997). Design>Web Design>SGML>3D