[xsl] using tokenize() and referencing parent elements

I'm using tokenize() but have to get the parent of the string token to
determine if the string is one thing, or another. I came across a
similiar post on the list.. but I can't seem to get it working with my
case:

<PS Class="SummaryKeyWords">
					<em>Local Governments Statutes Amendment Act</em>; <em>Municipal
Act; Fish Protection Act</em>Bill 25; riparian; endangered</PS>

<xsl:template match="PS[@Class = 'SummaryKeyWords']">
	<xsl:variable name="me" select="."/>
	<keywords>
		 <xsl:for-each select="tokenize(., ',|;')">
		 	<xsl:choose>
				<xsl:when test="$me[current() eq text()/parent::em]">
					<keyword><actname><xsl:value-of
select="normalize-space(.)"/></actname></keyword>
				</xsl:when>
				<xsl:otherwise>
		 			<keyword><xsl:value-of select="normalize-space(.)"/></keyword>
				</xsl:otherwise>
			</xsl:choose>
		 </xsl:for-each>
	</keywords>
</xsl:template>

<keywords>
 <keyword><actname>Local Governments Statutes Amendment Act</actname></keyword>
 <keyword><actname>Municipal Act</actname></keyword>
 <keyword><actname>Fish Protection Act Bill 25</actname></keyword>
 <keyword>riparian</keyword>
 <keyword>endangered</keyword>
</keywords>

<keywords>
 <keyword>Local Governments Statutes Amendment Act</keyword>
 <keyword>Municipal Act</keyword>
 <keyword>Fish Protection Act Bill 25</keyword>
 <keyword>riparian</keyword>
 <keyword>endangered</keyword>
</keywords>