Count all the elements of a column

Hello,

How can i do to count all the elements of a column in a table?

My table is build by a for-each tag.

Thanks in advance

<xsl:variable name="agent-sexe-F" select="agent/sexe[ text() = 'F' ]"/>

<xsl:variable name="somme-agent-sexe-M"
select="sum($agent-sexe-M/codenet)"/>



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