Xdata file format
From The DarkMod Wiki
Xdata (short for eXternal data) files provide a way for scripts to easily load settings that are stored externally. When readables were being coded, people requested that it be possible to load readable settings from an external file instead of being forced to store all readable information in the entity spawn-arguments. Since readables would need to load an arbitrary list of settings from the file, I figured I might as well make them use a general-purpose format. Xdata files were created as a result.
--Gildoran 09:32, 2 December 2006 (CST)
(currently under construction - check back in an hour)