[xsl] check if document exists

I'm trying to check if a document exists before I do something in a XSL 2.0
stylesheet, however it fails using XML Spy:


                        <xsl:variable
name="postnetfile">.\postnet<xsl:value-of
select="../@zip"/>.png</xsl:variable>
                        <xsl:choose>
                        
                        <xsl:when test="boolean(document($postnetfile))">
                        <fo:block padding-left="3mm" padding-top="5mm">
found postnet file
                                <!--<fo:external-graphic><xsl:attribute
name="src"></xsl:attribute></fo:external-graphic>-->
                        </fo:block>
                        </xsl:when>
                        </xsl:choose>

Result: "XSL transformation failed ue to the following error: Error in XPath
2.0 expression Error retrieving resource - 'C:\temp\postnet94030.png'

Can someone tell my what is wrong?

Rick


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