a very unusual namespace question

I have a stylesheet A that is outputting stylesheet B (using
xsl:namespace-alias'ing).  Stylesheet B will be matching elements from
namespace N so it must have a namespace declaration for N.  But the problem
is that namespace N is not known at the time I construct A and does not
appear in the input to A.  I would like to pass the prefix and URI for N to
stylesheet A as top-level parameters.  How can I get stylesheet A to
generate a namespace declaration in B from the parameters?  Thanks!




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