OH my. What a big example of two people talking in greek.
The file you want is located in data folder. If it's not there, try extracting it from data.bar.
ehh... if you are search any homecity, only enter in data3.bar, search a homecity, example: homecityotomans.xml.xmb
Arcalion is correct, but...
didnt really help, but solved on my own the homecityottmans.xml appears when u create a home city under that civ
Yes, he did help! The file you're messing with is inside My Documents, and it's really complex to ordinary people to understand that the My Documents folder should be ignored when modding. Try creating another "ottoman" savegame and you'll see your mod make *poof*
this xml file is used for control all about HC of any civ, depend of name and codders