Here is a quote worth considering
"If the Internet was the major development of the 90's, XML is the major development of this decade" W Gates
XML/XSL is creeping in everywhere, not just the Web
Many software vendors have adopted xml as a standard for a whole range of different applications.
For example you can use xml to create new skins and play lists for Windows Media Player 7
XML is becoming the most common tool for data manipulation and data
transmission.
It is also changing the way the web is used.
One of many possible examples is the use of RSS (xml) news feed files