Cast variable to node-set

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I have a template that I pass a node or node-set to.  Sometimes, I do some =
math prior to sending the data into the
template.  Once I've done an addition or subtraction, it's no longer a node=
-set, and my template breaks because the
variable that's passed in must resolve to a node-set.  What can I do?

--=20

David B. Bitton
david@xxxxxxxxxxxxxx

Diversa ab illis virtute valemus.

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