This
<xsl:when test="$issuance = 'continuing'">
<xsl:choose>
<xsl:when
test="$style-biblio/cs:reftype[(_at_)name='article-newspaper']">
<xsl:apply-templates
select="$style-biblio/cs:reftype[(_at_)name='article-newspaper']/cs:*">
<xsl:with-param name="source" select="."/>
</xsl:apply-templates>
</xsl:when>
<xsl:otherwise>
<xsl:apply-templates
select="$style-biblio/cs:reftype[(_at_)name='article']/cs:*">
<xsl:with-param name="source" select="."/>
</xsl:apply-templates>
</xsl:otherwise>
</xsl:choose>
</xsl:when>
could be written as
<xsl:when test="$issuance = 'continuing'">
<xsl:apply-templates
select="$style-biblio/(for $t in ('article-newspaper','article')
return cs:reftype[(_at_)name=$t])[1]/cs:*">
</xsl:when>
and I suspect the outer choose could be simplified as well although I
haven't follwed all your logic.
David
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