If a nodeset contains multiple elements with the same value then unioning
the nodeset with itself will not eradicate those duplicates.
If I have a nodeset containing
<a>1</a>
<a>2</a>
which I use as a lookup, then a nodeset created just by looking up the
value 1, 5 times will not contain <a>1</a> once and not 5 times.
The latter case is because a nodeset cannot contain multiple copies of the
same node.
Please correct my thinking here.
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