if then else

Hi

I wanted to use the 'if then else' clause inside the <xsl:value-of 
select="">. I tried doing it this way but its obviously wrong as it 
returns an error.
<Value type="TEXT" ref="{CONCEPT/@ref}">
   <xsl:value-of select="if(OBJECT-SLOT) then OBJECT-SLOT/@name else 
DATA-SLOT/@name"/>
</Value>

What would be the right way of writing it or is it incorrect to have it 
inside the select attribute of the xsl:value-of tag?
Appreciate any comments or suggestions
Rahil

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