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

["jo lemen" <jo_lemen@xxxxxxxxxxxxx>]

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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