You have it backwards, You are trying to use make the common stylesheet
include different stylesheets depending on a parameter, instead of doing
that refer directly to the specialised stylesheet that you need and have
each of those xsl:import the common code.


batch file:
...
java ... -IN data.xml -XSL bar-chart.xsl -OUT chart.svg  


bar-char.xsl
...
<xsl:import  href="chart.xsl"/>

David



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