What is the relationship between SGML, HTML, XML, and XHTML?
sobes.tech AI
Answer from AI
SGML (Standard Generalized Markup Language) is a meta-language for defining markup languages. It is the predecessor of HTML and XML.
HTML (HyperText Markup Language) is a markup language for creating web pages, based on SGML. It defines the structure and content of web documents.
XML (eXtensible Markup Language) is also a meta-language, a simplified subset of SGML, designed for describing data using customizable tags. It is more flexible than HTML in terms of data structure.
XHTML (eXtensible HyperText Markup Language) is a reformulation of HTML as an XML application. It adheres to strict XML syntax rules, making it more valid and parsable, but less forgiving of errors compared to traditional HTML. XHTML 1.0 is based on HTML 4.01.