Condition inside XML - File

Hey guys,

Can somebody tell me how i can write a condition into an xml file? For example, i have a variable which sets the language of the game. Like 1 for english, 2 for german etc. Now i wanna write all the dialogue into an xml file. Now i need to check the condition "if english-variable is 1" then ......... How would i write a variable check inside the xml document?

You need to follow this tutorial.