XSLT option disabled, please look at HelpOnConfiguration.
<?xml version="1.0"?>

<?xml-stylesheet href="XsltVersion" type="text/xml"?>

<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">

   <xsl:output method="html" omit-xml-declaration="yes" indent="no"/>

   <xsl:template match="/">
     Ce wiki utilise le moteur XSLT
     <xsl:value-of select="system-property('xsl:vendor')"/>
     (<a href="{system-property('xsl:vendor-url')}"><xsl:value-of select="system-property('xsl:vendor-url')"/></a>)
     qui met en &oelig;uvre XSLT version <xsl:value-of select="system-property('xsl:version')"/>
   </xsl:template>

</xsl:stylesheet>