Checking if node has data

Hi, 
I want to find out if a node say <fruits></fruits> in my XML file has data
in it or not and then decide as to what I need to do.

I can check if a nodes exists or not in XSL not sure how to check if it has
any data.

<xsl:if test="mygarden/fruits='true'">
.... Do something
</xsl:if>


Any help ?

regards,
raman