Is it possible to run something like that using the param option (or, even better, to do it in the editor)? (in capitals for clarity)

$ java -jar path/to/saxon9.jar LANG=en,fr,pt input.xml spreadsheet.xsl > output.xml

I guess it must be something like that, but then, how do I get those 3 or n parameters into the spreadsheet? If it was only one parameter i would get it with

<xsl:param name="lang"/>

but as there are more than one, I guess I should put them in a kind of array and then do a for-each?

  <xsl:template match="xliff">
    <xsl:copy>
      <xsl:variable name="file" select="file"/>
      <xsl:for-each select="$languages">
        <xsl:apply-templates select="$file">
          <xsl:with-param name="lang" select="."/>
        </xsl:apply-templates>
      </xsl:for-each>
    </xsl:copy>
  </xsl:template>

  <xsl:template match="file">
    <xsl:param name="lang"/>
    <xsl:copy>
      <xsl:attribute name="lang" select="$lang"/>
      <xsl:copy-of select="node()"/>
    </xsl:copy>
  </xsl:template>

	Martin Honnen
	http://msmvps.com/blogs/martin_honnen/