Re: General algorithm for finding nodes between PIs

I modified my input document slightly:

<?xml version="1.0" encoding="UTF-8"?>
<info>
    <?Fm Condstart VbV-VCO?>
    <p>For this, use <b>that </b>to do that.</p>
    <?Fm Condend VbV-VCO?>
    <p><?Fm Condstart USB?>If you need this, do that.<?Fm Condend USB?></p>
    <p>Outside paragraph.</p>
</info>

Here is how I have implemented Michael's stylesheet:

<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
 	xmlns:xs="http://www.w3.org/2001/XMLSchema"
 	exclude-result-prefixes="xs"
 	version="2.0">
 	
 	<xsl:output indent="yes"/>

 	<xsl:template match="/">
 		<results>
 			<xsl:apply-templates/>
 		</results>
 	</xsl:template>
 	
 	<xsl:template match="*[processing-instruction('Fm')[starts-with(.,
'Condstart')]]">
 		<xsl:for-each-group select="node()"
group-starting-with="processing-instruction('Fm')[starts-with(.,
'Condstart')]">
 			<xsl:if
test="self::processing-instruction('Fm')[starts-with(., 'Condstart')]">
 				<group name="{.}">
 					<xsl:variable name="pi-end-name"
select="replace(., 'Condstart', 'Condend')"/>
 					<xsl:for-each-group
select="current-group() except ."
group-ending-with="processing-instruction('Fm')[. = $pi-end-name]">
 						<xsl:if
test="current-group()[last()][self::processing-instruction('Fm')[. =
$pi-end-name]]">
 							<xsl:copy-of
select="current-group()[position() ne last()]"/>
 						</xsl:if>
 					</xsl:for-each-group>
 				</group>
 			</xsl:if>
 		</xsl:for-each-group>
 		<xsl:apply-templates/>
 	</xsl:template>
 	
 	<xsl:template match="text()"/>
 	
</xsl:stylesheet>

Here is my output:

<?xml version="1.0" encoding="UTF-8"?>
<results>
   <group name="Condstart VbV-VCO">
      <p>For this, use <b>that </b>to do that.</p>
    </group>
   <group name="Condstart USB">If you need this, do that.</group>
</results>

This is close, but I don't want to lose any elements from the output, like
the parents of the processing instructions (<info>, <p>). Also, I am not
picking up my last <p> element.