Glad to see this issue at hand reolved so elegantly but if I might
clarify one digressional point:

DeMorgan's Law: is not
  "AND" is the same as "not( OR )"
but rather
 "AND" is the same as "not( NOR )"

On Thu, Sep 5, 2013 at 4:24 PM, G. Ken Holman
<gkholman@xxxxxxxxxxxxxxxxxxxx> wrote:
> I think Michael wins this one!
>
>
> . . . . . . Ken
>
> At 2013-09-05 21:06 +0100, Michael Kay wrote:
>>
>> How about
>>
>> deep-equal($v[position() mod 2 = 0], $v[position() mod 2 = 1])
>>
>> Michael Kay
>> Saxonica
>

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