If you use xslt variables it's important to check for null values

because I'm not using XSLT to much and tend to forget this syntax, this is how you can check for null values in XSLT:

First creat an empty string:

 < xsl:variable name="empty_string"/ >

Then check if you're value is not equal to this empty strint:

 < xsl:if test="value != $empty_string" >

To check if the value is numeric, you can use this:

 < xsl:if test="value = not (string(.))" >

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