So I have the following code:

<redirect:write select="concat('..\\folder\\,string(filename),'.xml')">

Where "filename" is a tag in the xml source. My problem occurs when filename is null or blank. And this is the case for several of the xml filename tags. So what I am trying to implement is a checking method. This is what I have done:

<xsl-if test = "filename != ''">
        <xsl:variable name = "tempName"  select = "filename" />
        </xsl-if>
        <xsl-if test ="filename = ''">
        <xsl:variable name = "tempName" select = "filenameB"/>
        </xsl-if>

<redirect:write select="concat('..\\folder\\,string($tempName),'.xml')">

I seem to be getting NPEs when I compile my Java code, saying the Variable not resolvable: tempName