<xsl:choose>
<xsl:when test="ancestor::exp-level-1">
<xsl:value-of select="(if
(ancestor::exp-level-1/heading[(_at_)type =
'electronic-only']) then ancestor::exp-level-1/heading[(_at_)type =
'electronic-only'] else ancestor::exp-level-1/heading[(_at_)type =
'running-head'])"/>
</xsl:when>
<xsl:when test="ancestor::misc-level-1">
<xsl:value-of
select="ancestor::misc-level-1/heading[1][(_at_)type !=
'running-head']"/>
</xsl:when>
<xsl:when test="ancestor::law">
<xsl:value-of select="ancestor::law/heading[(_at_)type =
'electronic-only']"/>
</xsl:when>
<xsl:when test="ancestor::reg">
<xsl:value-of select="(if (ancestor::reg/heading[(_at_)type =
'electronic-only']) then ancestor::reg/heading[(_at_)type =
'electronic-only'] else ancestor::reg/heading[(_at_)type =
'running-head'])"/>
</xsl:when>
<xsl:when test="ancestor::group">
<xsl:value-of select="(if
(ancestor::group[1][not(descendant::misc-level-1 or
descendant::exp-level-1)]/heading[(_at_)type = 'electronic-only']) then
ancestor::group[1]/heading[(_at_)type = 'electronic-only'] else
ancestor::group[not(descendant::misc-level-1 or
descendant::exp-level-1)][heading[1]]/heading[1])"/>
</xsl:when>
<xsl:otherwise>
<xsl:value-of select="parent::*/heading[1]"/>
</xsl:otherwise>
</xsl:choose>
I think that says to choose in order of preference
ancestor,exp-level-1,misc-level-1,law,reg,group,any parent
then choose in order of prefernce the heading with type
electronic-only,running-head, anything
which is
<xsl:value-of select="
(ancestor::exp-level-1,ancestor::misc-level-1,ancestor::reg,,ancestor::law,ancestor::group,parent::*)[1]/
(heading[(_at_)type ='electronic-only'],heading[(_at_)type
='running-head'],heading)[1]"/>
actually that's not quite the same (for the particularly intricate
ancestor::group case but it's neary enough while I'm having lunch...
David
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