document and key functions in xslt

Hi,

I would like to know why these examples don't work:

1. <xsl:for-each select="document('annuaire.xml')/key('mykey',$myname)">
...
</xsl:for-each>

where the result of the key function gives as result a node set of the
annuaire.xml file

2. <xsl:template match="document('foo.xml')">
...

document(...) gives as result the root node of the document so is equivalent
with match="/"


thanks


Cornelia


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