Re: XSLT error: The expression does not evaluate to a

Your default definition of panels_a is
  <xsl:param name="panels_a" />

which makes a zero-length _string_ so as its a string you can't do

$panels_a[following-sibling::*]"/>

what you want for a default is an empty node set, not an empty string so

 <xsl:param name="panels_a" select="/.."/>


/.. doesn't select anything but does generate a node set.

David

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