10. The method of claim 7 , wherein the debugging comment corresponding to the program variable identifies the program variable and indicates a value of the program variable.
10. The method of claim 7 , wherein the debugging comment corresponding to the program variable identifies the program variable and indicates a value of the program variable. 11. The method of claim 10 , wherein: the program elements are arranged as a node-set; the program variable is a child node of a parent node; and the debugging comment corresponding to the program variable identifies the parent node and indicates a value of the parent node.