[xsl] fixing XSL search using values from a variable against multiple XM

Hi this is my first post here - looking for help - apologies if there's 
something I've overlooked!
I have a tokenized variable that contains list of filenames from a .txt 
of a directory listing. I want to look for those filenames in a number 
of xml files in a number of subdirectories. If the filename is found, I 
want to output that "filename" was found in "xmlfile".
There are a lot of xml directories and they are not static. Same with 
xml files. The filenames are not tagged in the xml, so I'm just looking 
for their plain text occurence in the file.
Any help would be appreciated.

to make the examples easier - I want to use

$filenames_to_find (tokenized list of filenames from a .txt directory 
listing)
to search against

dir1/*.xml
dir2/*.xml
with the output being

filename was found in xmlfilename

I'm using an academic version of Oxygen XML so I think I have Saxon 
through that and I have the standalone Saxon file for running this from 
the command line.
I've gotten this far, but it doesn't work. I know it's broken, but I 
don't know how to fix it!
<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform";
    xmlns:xs="http://www.w3.org/2001/XMLSchema";
    xmlns:h="http://www.w3.org/1999/xhtml";
    exclude-result-prefixes="xs"
    version="3.0"
    expand-text="yes"
    >

    <xsl:variable name="filenames_from_directory_listing" 
as="xs:string" 
select="unparsed-text('filenames_from_directory_listing.txt')"/>
    <xsl:variable name="filenames_to_find" 
select="tokenize($filenames_from_directory_listing, '\s+')"/>
    <xsl:template match="/">
        <xsl:for-each select="collection('.?select=*.xml;recurse=yes')"/>
            <xsl:variable name="xml_filenames" select="."/>
                <xsl:for-each select="$filenames_to_find">
                    <xsl:if test="(contains($t, .))">
<xsl:message>{document-uri($xml_filenames)} contains {.}</xsl:message>
                    </xsl:if>
                </xsl:for-each>
    </xsl:template>
</xsl:stylesheet>

Any suggestions? Clearly I am an XSL novice. Thanks for your patience.
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