public void addVariable(VariableInitializer v){
  assertNotNull(v);
  variables.add(v);
  v.setParent(this);
}

public void addVariable ( VariableInitializer v ) { assertNotNull ( v ) ; variables . add ( v ) ; v . setParent ( this ) ; }
adds a variable initializer node to the child list . sets initializer node ' s parent to this node .
