1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19
<?xml version="1.0"?> <Program> <Function id="f"> <Scope></Scope> </Function> <Variable id="g" /> <Function id="x"> <Parameter id="y" /> <Scope> <Variable id="z" /> <Scope> <Variable id="r" /> </Scope> <Scope> <Variable id="f" /> </Scope> </Scope> </Function> </Program>