<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
  <xsl:import href="cdcatalog.xsl" />
  <xsl:variable name="xsl-url" select="'undef'" />
  <xsl:variable name="xsl-url2" select="'somethingelse'" />
  <xsl:template match="/">
    <xsl:apply-imports />
  </xsl:template>
</xsl:stylesheet>