XML
XML or Extensible Markup Language
Read here for the Wiki definition : http://en.wikipedia.org/wiki/XML
Get a quick tutorial here : http://www.w3schools.com/Xml/
You can join the online discussions to further immerse yourself in in xml and in turn understand xmlsh.
http://www.tek-tips.com/threadminder.cfm?pid=426
http://www.ibm.com/developerworks/forums/dw_xforums.jspa
http://www.jguru.com/forums/home.jsp?topic=XML
