<xsl:param name="literal.environment">
  <xsl:choose>
  <xsl:when test="contains($literal.extensions,'scale')">
    <xsl:text>lstcode</xsl:text>
  </xsl:when>
  <xsl:otherwise>
    <xsl:text>lstlisting</xsl:text>
  </xsl:otherwise>
  </xsl:choose>
</xsl:param>