this is essentially a grouping problem: you want to group all nodes
between matching Pis together, and any of the standard XSLT1 grouping
techniques can be used.
I can't tell from your posting whether it's a hard or an easy problem
In particular, where can the processing instructions appear.
If I insert some text that starts in one element and finishes in another
do I edn up with
<para> fooo <?xm-insertion_mark_start ?> bar</para>
<para> more bar <?xm-insertion_mark_end ?> more foo>/para>
If so, your problem is "interesting".
If the PIs always appear in pairs that are well balanced with respect to
the element nesting, the problem is a lot less "interesting" but a lot
more feasible to supply a completely general solution.
I'll assume the latter, and offer the standard key based grouping
method:
<xsl:key name="p" match="node()"
use="generate-id(preceding-sibling::processing-instruction('xm-insertion_mark_start'))"/>
then whenever you would have use apply-templates, use
<xsl:choose>
<xsl:when test="text()[normalize-space()] and
processing-instruction('xm-insertion_mark_start')">
<xsl:apply-templates
select="processing-instruction('xm-insertion_mark_start')[1]/preceding-sibling::node()"/>
<xsl:for-each
select="processing-instruction('xm-insertion_mark_start')">
<span class="revcontrol>
<xsl:apply-templates select="key('p',generate-id())"/>
</span>
</xsl:for-each>
</xsl:when>
<xsl:when test="processing-instruction('xm-insertion_mark_start')">
<xsl:apply-templates
select="processing-instruction('xm-insertion_mark_start')[1]/preceding-sibling::node()"/>
<xsl:for-each
select="processing-instruction('xm-insertion_mark_start')">
<div class="revcontrol>
<xsl:apply-templates select="key('p',generate-id())"/>
</div>
</xsl:for-each>
</xsl:when>
<xsl:otherwise>
<xsl:apply-templates/>
</xsl:otherwise>
</xsl:choose>
David (untested)
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