[xsl] How to check if document(file) was able to find and read the file?

[r.devries@xxxxxxxx]

Hi,

I want to display an error message if with document(file) the file doesn't
exist. How can I check that?

So I have:
<xsl:variable name="Descriptions" select="document('Descriptions.xml')"/>

and I want to test if Descriptions contains anything, but these won't work:
<xsl:when test="$Descriptions">
<xsl:when test="count($Descriptions)>0">

Greetings René
   {@   @}
        ^
      \_/

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