XSLT Check Null value and replace with 0 or other character

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C#

ASP.NET

XSL

Hi Friends

i have a function where i generate XLS using xslt transformation , the complete secanrio is as follows

i am using single XLST Template for different dataset's and generating xls file from it

since i cannot create different xslt template for each dataset or report, i am using template and using below function to populate the value ,

<xsl:value-of select="." />

the problem is when the dataset column has null value the column in xml is skipped and spoil the entire xlst transformation as the rows are pushed wrongly

is there a way to check if the current column is null and replace it with 0 or hypen "-" ,
in the below code itself without actually specifying the column name

<xsl:value-of select="." />

since my dataset and column are dynamic i cannot specifiy the column in xls if condition , you guys help will be really appreciated