I have an XML file that is validated by DTD A. Now I want to transform this XML file to another format which is valid to another DTD, say DTD B. I know that I have to use XSLT and map one element from DTD A to the element of DTD B. But this is actually a very long process, is there a way in making it easier or an application that deals with this problem? thanks.

You might find that the visual mapping tools in products like Stylus Studio and Altova Mapforce take the tedium out of the job. I personally prefer to hack the code in a text editor - I'm not a very visual sort of person - but a lot of people seem to like these tools and find them beneficial.

Michael Kay
http://www.saxonica.com/
Author, XSLT Programmer's Reference and XPath 2.0 Programmer's Reference

ok thanks... hacking the code? interesting... =D