xsl:if

how do i write if strtement if there are both the side of the = sign are
variables

suppose i have a xml string as 
<test att1="1" att2="2">

now i ahve to do somthing as if att1=att2 then do somthing

but this 
<xsl:if test="@att1[.=@att2]"> dosent work  so how do i get this ???

thanks and regards
anil


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