Takes two list arguments.
This function returns:
1 -- the list contains all elements contained in another list
0 (zero) -- the list does not contain all elements contained in the second list
The following expression returns 0.
<containsAll>
<ref>fruitlist</ref>
<list>
<s>oranges</s>
<s>wiper blades</s>
</list>
</containsAll>