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Web Design Glossary: X

XHTML
XHTML stands for "Extensible Hypertext Markup Language". It is a reformation of HTML as an XML vocabulary.
XML
XML stands for "Extensible Markup Language". It is a language specification from the W3C that allows users to develop their own markup languages (often called vocabularies), and format their documents using style sheets to be presented on a browser if desired. It is a syntax/format, establishing rules for XML-compliant languages with a very strict set of rules that must be adhered to, allowing lots of control over document format.
XSL
XSLstands for "Extensible Style Language". It is a W3C specification that contains three parts:
  1. Extensible Stylesheet Language Transformations (XSLT) for changing the formatting and structure of markup according to a set of rules
  2. Extensible Stylesheet Language Formatting Objects (XSL-FO) for applying a strong set of rules to a document to ensure reliable formatting when printed
  3. XPath to select the elements required by an XSLT