construct query string

I'm attempting to construct a query string ("?param1=blah&param2=blah2",
for example) using the values of a series of tags in an XML document. My
first intuition was to create an XSL variable, and then send the
transformer into a loop which concats each param tag onto that variable.
However, after reading the W3C doc, it doesn't seem like that's feasible
because you can't "shadow" a XSLT variable in the same template context,
and you can't reference the variable you're trying to declare in the
variable definition.  TIA.

-Zack



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