Count problem

Hi
I'm trying this ..

<xsl:variable name="total" select="count
($t4-31.Envelop.TaskEnvelop.Contents.TaskSheet.TaskSheetInstructions.Instruction.DataSet.Query.WhereDetails.Description/@Name

)"/>

and this return me total number of @Name ..means it also count those @Name
which has ""(empty)value .
So I want to know is it possible to count only those @Name ....which are
not empty. if it is possible ..then anyone tell me how.

thanks
Mukul






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