sort elements in external document

I want to sort an xml document by data from an external document. Let me see if I can explain this: I have list.xml:

<list>
    <file>file1.xml</file>
    <file>file2.xml</file>
...
    <file>file100.xml</file>
<list>

each of the fileX.xml have inside a date tag: <date>20071015102000</date>(yyyymmddhhmmss). I want to sort the list.xml by the date in each file. The way I did it:
<xsl:for-each select="file">
<xsl:variable name="filename" select="file"/>
<xsl:sort order="descending" select="document($filename)/date">

   File:    <xsl:value-of select=".">     Date: <xsl:value-of select="document($filename)/date">
</xsl:for-each>

The document will list the dates but it doesn't sort them.

I also tried <xsl:sort order="descending" data-type="number" select="document($filename)/date"> but it doesn't work. It sorts the list alphabetically after the name of file...file1,file2...file100. What am I doing wrong? 10x


       
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