XML is a Meta Markup Language Not like html troff, latex Make up the tags you need as you need them The tags you create can be documented in a Document Type Definition(DTD) A meta syntax for domain-specific markup languages like MusicML. MathML and Xhtml Languages for Semantic WebLanguages for Semantic Web 11 XML is a Meta Markup Language • Not like HTML, troff, LaTeX • Make up the tags you need as you need them • The tags you create can be documented in a Document Type Definition (DTD) • A meta syntax for domain-specific markup languages like MusicML, MathML, and XHTML