xpp {

/* Define the XFeline class */

class XFeline {

public:

int pi;

};

/* Instantiate the MyNode object as an instance of the abstract class Node */

/* Note that MyNode contains Animals, which in turn contains cats and dogs */

node MyNode {

<Animals>

<cats age="old" class="XFeline" construct="false" var_int_pi="3.14">5</cats>

<dogs>4</dogs>

</Animals>

};

/* Set the value of cats to be the value of dogs */

$MyNode/Animals/cats = $MyNode/Animals/dogs;

/* Write the age attribute of cats */

xout("\r\nage = " + $MyNode/Animals/cats.age);

/* Write the pi member of cats */

xout("\r\npi = " + $MyNode/Animals/cats.pi);

}