>All programming languages are Turing-complete thus compatible. So you shan't need much more than Brainfuck. XSL-T 1.0 is Turing complete but you can't really

>All programming languages are Turing-complete thus compatible. So you shan't need much more than Brainfuck. XSL-T 1.0 is Turing complete but you can't really write a C compiler in it - despite what some people may have been heard to claim at various XML conferences in 2000 - because what matters in most things is what rights and accesses the language offers you and XSL-T 1.0 does not give you the possibility of loading in non-XML files.