matching certain attributes in other xml files with th

hi y'all!

i want to test if the value of a variable ('object-id') of my xml file which
is processed by the stylesheet matches the id-parameter of another xml file
('foo.xml'). 
if it´s true. i´d like to get the value of the 'xlink:href' attribute in
foo.xml and store it as a variable ('doc-id').

my attempt was the following:
<xsl:variable name="object-id" select="child::object-id"/>
<xsl:variable name="doc" select="document('foo.xml')"/>
<xsl:variable name="doc-id"
select="$doc/root/object[@id=$object-id]/path[@xlink:href]"/>

here is the xml file 'foo.xml':
<root>
<object id="090f428d800073a8">
<path xlink:type="locator" xlink:href="someDocument.htm"/>
</root>

i can´t understand why $doc-id doesn´t have any value. 
if i write: <xsl:variable name="doc-id" select="$doc//@id"/> 
the return is the id parameter ('090f428d800073a8') of the object element in
foo.xml, but i can´t test if it matches my $object-id.
this way is also incorrect:
<xsl:value-of
select="document('foo.xml')/root/object[@id=$object-id]/path[@xlink:href]"/>

any ideas of how to get that problem solved?
thanks in advance.

christian

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