A book/CD-ROM describing the role of all SGML constructs and explaining how they have been used to define the latest extensions to HTML. Explains SGML markup declaration constructs and gives examples of their use, walks through the latest HTML DTD, and examines how HTML elements are defined and used, including those used for creating interactive forms. Also discusses SGML developments on the horizon and how they could impact the future of HTML. The CD-ROM contains an electronic version of the book in HTML format with hypertext links, and JADE, a software tool that converts HTML text to RTF. This second edition is revised and reorganized. For Web professionals. Annotation c. by Book News, Inc., Portland, Or.