We are continually seeking to grow and improve this glossary, so if you spot any definition you do not agree with, a term that is missing, or have any comments in general, please email our reference team.
| Xerographic Paper | Papers made to reproduce well in copy machines and laser printers |
| XML (eXtensible Mark-up Language) | EXtensible Markup Language - a form of SGML that allows the user to cutomize tags to give functionality that is not available in HTML |