Is there a way to pass the parameter if the tested attribute
exists and not pass anything, not even an empty string, if it
does not?
No: the only way to get the default value is to omit the xsl:with-param
entirely.
It seems you need a different mechanism here, instead of
<xsl:param name="p" select="default"/>
you want
<xsl:param name="p" select="()"/>
<xsl:variable name="p1" select="if ($p) then $p else default"/>
That's 2.0 syntax of course but the principle is the same.
Michael Kay
http://www.saxonica.com/
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