Student Menu. © Lesson 1. Printable layout. Links won't function in print.


                                                     Evolution of Mark-up


                                                                                                    mark-up
                                                                                |
                                                                                |
                                                                generalized mark-up
                                                                                |
                                                                                |
                              |----SGML (Standardized Generalized Mark-up Language)
                              |          |
                              |          |                                                                                                       
           XHTML  --------- | --- HTML (Hypertext Mark-up Language) ----- DHTML (Dynamic)
                 |           |
                  |           |
                  ---- XML (eXtensible Mark-up Language) ----- XSL (eXtensible Style Language)

Note: In print, the hyperlinks above won’t function. Please visit www.techweb.com/encyclopedia/ for definitions.

Mark-up is formatting—like bold or italics—added to a document to manage its appearance.

Generalized mark-up only describes the structural hierarchy of text within a document.

HTML uses CSS (Cascading Styles Sheets) to separate content from style.
DHTML utilizes three technologies: HTML for content, CSS for style and a scripting language to modify the DOM (Document Object Model)

HTML is an application of SGML
XML is a subset of SGML.
XHTML is a reformulation of HTML 4 in XML.

HTML is computer to person. XML is computer (database) to computer (database).
Mark-up has evolved from primarily displaying to describing AND displaying.