document() function not working in Saxon 7.8

Hello!

The following template:

<xsl:template match="url">
  <xsl:copy-of select="document(.)/page/*"/>
   <url>
     <xsl:attribute name="page_id"><xsl:value-of
select="translate(@page_id,':','_')"/></xsl:attribute>
     <xsl:value-of select="."/>
     <xsl:apply-templates/>
   </url>
</xsl:template>

This works in Saxon 7.2, 7.4 BUT NOT in Saxon 7.8 - there i get the
following error:
"Invalid URI [./dir1/dir2/dir3/x.xml] - base [file:/X:/index.xml]"

Is there a way to get this template running in Saxon 7.8?

Thanks
Markus

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