<xsl:if test="p[@class='box']">
from the outside and just have a single for-each-group so that you only
get each output element once.
<xsl:for-each-group select="*"
group-adjacent="string(self::p/@class)"
Now your elements are grouped and inside there you can have a -single_ xsl:choose
deciding what to surround the group with
<xsl:choose>
<xsl:when
test="self::p/@class[contains(.,'box')]">
<box type="box"
page="{replace(preceding-sibling::p[@class='pageNumber'][1],'Page ','')}">
<xsl:apply-templates
select="current-group()"/>
</box>
</xsl:when>
<xsl:when
test="self::p/@class[contains(.,'exercise')]">
<exercise>
<xsl:apply-templates
select="current-group()"/>
</exercise>
</xsl:when>
<xsl:otherwise>
<xsl:apply-templates
select="current-group()"/>
</xsl:otherwise>
</xsl:choose>
</xsl:for-each-group>
David
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