| 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 |
| RelaxNG | Not an acronym, as far as we know |
| TEI | Text Encoding Initiative |