code: public Inheritance<Entity<T>> getOrCreateInheritance()
     {
        Node node = childNode.getOrCreate("inheritance");
        Inheritance<Entity<T>> inheritance = new InheritanceImpl<Entity<T>>(this, "inheritance", childNode, node);
        return inheritance;
     }
docs: If not already created, a new <code>inheritance</code> element with the given value will be created.
  Otherwise, the existing <code>inheritance</code> element will be returned.
  @return  a new or existing instance of <code>Inheritance<Entity<T>></code>