how check if the node exit and display content of it

i create xml files .
the node "Group" could has 
child:
<Group>
<undergroups>
<Duration>1:9</Duration>
<description>Waiting for data</description>
</undergroups>
</Group>
or could be without child:
<Group>
</Group>
How could i check in my xsl file if this node 
has some child (f.example <Duration>
or <description>)
after that i will to display the 
Result(f.example Waiting for data) in browser
i tied it with xsl:if test and xsl:variable
but could'nt use it correctly!


thanks
henry






	

	
		
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