Function Def
<?xml version="1.0"?>
<Program>
<Variable id="a" />
<Variable id="b" />
<Variable id="c" />
<Variable id="yann" />
<Variable id="is" />
<Variable id="the" />
<Variable id="best" />
<Variable id="d" />
<Variable id="hello" />
<Variable id="asd" />