This is my personal opinion and not by Javaranch.(Staff's can delete my post if it is rude).
Suresh!..
Correct me if i'm wrong.
Everyone will have their own skils levels, but still then it will be much better if you could google/search quesitons like these and come with more specific questions instead of theoritical question with Urgent title. It will help others to recap their as knowledge as well when you are very specific and tricky.
XML vs HTML