What is XML markup for?

8. Some alphabet soup

SGML Standard Generalized Markup Language
HTML Hypertext Markup Language
W3C World Wide Web Consortium
XML eXtensible Markup Language
DTD Document Type Definition (or Declaration)
CSS Cascading Style Sheet
Xpath XML Path Language
XSLT eXtensible Stylesheet Language - Transformations
XQuery XML Querying
RELAXNG Regular Expression Language for XML (New Generation)

Oh, and then there's also TEI, the Text Encoding Initiative

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