[xsl] word search a document and eliminate duplicate results

["Susan" <laborde@xxxxxxxxxxxx>]

Hello,
   Maybe I'm missing the obvious, but I've Googled forever and am still 
lost.  I want to search a document for every occurrence of a particular word 
and output each paragraph that includes the search term. My code works fine 
except that if the search term appears in one paragraph 3 times, then I get 
that paragraph three times in the output.  I do not want to repeat same 
paragraph.
   I'm not sure what I should be looking for.  I know a little about how to 
de-duplicate using keys, but I don't see how that can work in this case. And 
I know almost nothing about recursion.  Is that what is required here?  Any 
pointers would be greatly appreciated.
   Thanks,
   Susan

The xml looks like this (I do hope this makes sense):

   <p>
       ...may contain text only or a mixture of text and other elements...
   </p>
   <p>...may contain...
       <note>a note with text only</note>
   </p>
   <p>...may also contain...
       <note>no paragraph tags here, just text<p>2nd paragraph of 
note</p><p>3rd paragraph of note</p></note>
       ...more text...
   </p>

   The search term ($target1) may appear within a <p>, within a <note>, or 
within a <p> that is within a <note>.  If it occurs anywhere within a note, 
then I need not only the note but the paragraph in which it resides.  Which 
further muddies the water because if a paragraph contains the search term 
and that same paragraph also contains a <note> that contains the search 
term, I still need to output that paragraph only once.  My stylesheet 
(stripped of all the formatting stuff) looks like:

*****
<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform"; 
version="1.0">

<xsl:variable name="target1">
 <item>find-this-word</item>
</xsl:variable>

<xsl:variable name="select-elements">
<item>p</item>
</xsl:variable>

<xsl:template match="/">
   <xsl:apply-templates select="/" mode="search">
       <xsl:with-param name="term" select="$target1"/>
       <xsl:with-param name="element" 
select="document('')/*/xsl:variable[@name='select-elements']/item"/>
           </xsl:apply-templates>
</xsl:template>

<xsl:template match="/" mode="search">
   <xsl:param name="term" select="''"/>
   <xsl:param name="element" select="''"/>
       <div>
           <xsl:apply-templates select="@*|node()" mode="search">
               <xsl:with-param name="term" select="$term"/>
               <xsl:with-param name="element" select="$element"/>
                   </xsl:apply-templates>
       </div>
</xsl:template>

<xsl:template match="@*|node()" mode="search">
   <xsl:param name="term" select="''"/>
   <xsl:param name="element" select="''"/>
       <xsl:copy>
           <xsl:apply-templates select="@*|node()" mode="search">
               <xsl:with-param name="term" select="$term"/>
               <xsl:with-param name="element" select="$element"/>
           </xsl:apply-templates>
       </xsl:copy>
</xsl:template>

<xsl:template match="text()" mode="search">
   <xsl:param name="term" select="''"/>
   <xsl:param name="element" select="''"/>
       <xsl:choose>
           <xsl:when test="contains(.,$term)">
               <xsl:for-each select="ancestor::p[not(parent::note)][1]">
                   <xsl:apply-templates/>
                   <hr/><br/>
               </xsl:for-each>
           </xsl:when>
           <xsl:otherwise/>
       </xsl:choose>
</xsl:template>
*****