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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