HTML Unleashed. SGML and the HTML DTD: Summary

n this chapter, we've learned the foundations of SGML, a metalanguage of logical markup, and analyzed the HTML DTD, the definition of HTML syntax in terms of SGML.  In particular, we discussed the following topics:

• What is the difference between presentational and generic markup and what is the importance of the latter;

• What was the purpose of creating SGML and how went the history of its development;

• What information on the properties of HTML can be elicited from the SGML declaration for HTML;

• How HTML DTD defines entities, elements, and elements' attributes that make up the language;

• Where on the Internet one can find additional information and DTD-related resources;

• What are the benefits of maintaining HTML as an SGML application.