numbering

hello
i load the data from one xml file for showing into onw html page with:
<xsl:for-each select="node">
<xsl:value-of select="nodename"/>
</xsl:for-each>

but i want to show the data with one number:
1.- text
2.- text
3.- text

how can i put this number for each nodename (<xsl:value-of
select="nodename"/>)

can anybody helps me?
thanks