[xsl] Filtering RSS feed with xsl based on presence of certain words in

I'm trying to filter an external rss feed using xls so that only 
those feed items that contain at least one of a list of words are 
selected. The code below does that, but I'm wondering if there 
isn't a more succint and easier to maintain way, for example using 
an xsl include, putting the list in an external xml file, using 
variables or parameters ..

<?xml version="1.0" encoding="ISO-8859-1"?>
<xsl:stylesheet version="1.0" 
xmlns:xsl="http://www.w3.org/1999/XSL/Transform";>
<xsl:output method="html" encoding="ISO-8859-1" />
<xsl:template match="*">
<xsl:for-each select="//item">
<xsl:if test="contains(description, 'word1') 
or contains(description, 'word2') 
or contains(description, 'word3') 
or contains(description, 'word4') 
or contains(description, 'word5') <--- plus 20 or more other words -->
<xsl:if test="position()<10">
<p>
<strong><xsl:value-of select="title" /></strong>
<xsl:text disable-output-escaping="yes"><br /></xsl:text>
<em>
<xsl:variable name="convertdate" select="pubDate" />
<xsl:variable name="pubday" select="substring($convertdate, 6,2)" />
<xsl:value-of select="$pubday" />
<xsl:text>/</xsl:text>
<xsl:variable name="pubmonth" select="substring($convertdate, 9,3)" />
<xsl:choose>
        <xsl:when test="$pubmonth='Jan'">01</xsl:when>
        <xsl:when test="$pubmonth='Feb'">02</xsl:when>
        <xsl:when test="$pubmonth='Mar'">03</xsl:when>
        <xsl:when test="$pubmonth='Apr'">04</xsl:when>
        <xsl:when test="$pubmonth='May'">05</xsl:when>
        <xsl:when test="$pubmonth='Jun'">06</xsl:when>
        <xsl:when test="$pubmonth='Jul'">07</xsl:when>
        <xsl:when test="$pubmonth='Aug'">08</xsl:when>
        <xsl:when test="$pubmonth='Sep'">09</xsl:when>
        <xsl:when test="$pubmonth='Oct'">10</xsl:when>
        <xsl:when test="$pubmonth='Nov'">11</xsl:when>
        <xsl:when test="$pubmonth='Dec'">12</xsl:when>
</xsl:choose>
<xsl:variable name="pubyear" select="substring($convertdate, 13,4)" />
<xsl:text>/</xsl:text>
<xsl:value-of select="$pubyear" />
</em>
<xsl:text disable-output-escaping="yes"><br /></xsl:text>
<xsl:value-of select="description" disable-output-escaping="yes" />
<xsl:text> .. </xsl:text>
<a>
        <xsl:attribute name="href">
        <xsl:value-of select="link" />
        </xsl:attribute>
        <xsl:attribute name="title">full story</xsl:attribute>
        <xsl:text>full story</xsl:text>
</a>
</p>
</xsl:if>
</xsl:if>
</xsl:for-each>
</xsl:template>
</xsl:stylesheet>


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