[xsl] How to access an array from a node-set variable

[Maria Amuchastegui <mamuchastegui@xxxxxxxxxxx>]

This is my data:

<Date>2004-08-02</Date>

Which I would like to display as follows:

02 ao{t 2004

I have placed an array of French month names in a node-set:

<xsl:variable name="FrenchMonth">
    <MonthNames>
        <MonthName MonthNumber="01">janvier</MonthName>
        <MonthName MonthNumber="02">f&#233;vrier</MonthName>
        <MonthName MonthNumber="03">mars</MonthName>
        <MonthName MonthNumber="04">avril</MonthName>
        <MonthName MonthNumber="05">mai</MonthName>
        <MonthName MonthNumber="06">juin</MonthName>
        <MonthName MonthNumber="07">juillet</MonthName>
        <MonthName MonthNumber="08">aou&#251;t</MonthName>
        <MonthName MonthNumber="09">septembre</MonthName>
        <MonthName MonthNumber="10">octobre</MonthName>
        <MonthName MonthNumber="11">novembre</MonthName>
        <MonthName MonthNumber="12">d&#233;cembre</MonthName>
        </MonthNames>
</xsl:variable>

And I created the following template:

<xsl:template name="FrenchDate">
    <xsl:variable name="year" select="substring-before(., '-')"/>
    <xsl:variable name="month" select="substring(.,6,2)"/>
    <xsl:variable name="day" select="substring(.,9,2)"/>
        <xsl:value-of select="$day"/>
        <xsl:text> </xsl:text>
        <xsl:value-of
select="exsl:node-set($FrenchMonth)/MonthName[@MonthNumber=$month]"/>
        <xsl:text> </xsl:text>
        <xsl:value-of select="$year"/>
</xsl:template>

Which I attempt to call as follows:

<xsl:template match="/">
    <xsl:for-each select="//Date">
        <xsl:call-template name="FrenchDate"/>
        <br/>
    </xsl:for-each>
</xsl:template>

How come it doesn't work?

Maria