<xsl:if test="not(Found)">
That tests if there is a child element with name Found, the variable,
which you would reference as $Found is never referenced, so a system
might or might not execute its definition. (Saxon warns if you define a
variable and then don't use it).
I suspect you intented to use $Found, although as you haven't used an as
attribute on xsl:variable, $Found will be a document node (if the
<xsl:for-each generates anything) or an empty string otherwise. the
effective boolean valued of these are true and false respectively,
although it's a rather roundabout way of testing that,
David
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