HTML
HTML is the “native language” of the WWW
SGML (Standard Generalized Markup Language)
- ISO standard
- HTML is SGML application
- SGML Document Type Definition (DTD)
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0//EN” "http://www.w3.org/TR/REC-html40/strict.dtd">
standards:
- HTML 1.0, 2.0, 3.0, 3.2, 4.0, … , XHTML 1.0
- browser extensions (Netscape, MS IE, ...)
- other MLs: VRML, SMIL, MathML, XML, ...