Verified answer

google for

XML tutorial

or

C++ tutorial

Wikiversity (a division of Wikipedia) has some free lessons and exercises that could offer a starting point without having to pay.

This is the address of the Computer Science "division" of the Wikiversity:

en.wikiversity.org/wiki/Portal:Computer_Science

Here is a tutorial site on xml

http://www.w3schools.com/xml/default.asp

Here is a nice one on C++

http://www.tiny.cc/eyJxg

or

http://www.oopweb.com/CPP/Documents/CPPHOWTO/Volum...