How to group using text content? - xslt-2.0

Question

I have following xml :
<note>
<para>customer name :</para>
<para>mr. Joe Someone</para>
<para>calling from :</para>
<para>1234567</para>
<para>device model :</para>
<para>ABC-123</para>
<para>issue:</para>
<para>some info</para>
<para>some more info</para>
<para>and even more info</para>
<para>solution :</para>
<para>some solutions</para>
<para>and some more solutions</para>
</note>
and I would like to group on every node where the text ends with a doubledot, so the result would become something like below :
<note>
<para>customer name :</para>
<groupdata>
<para>mr. Joe Someone</para>
</groupdata>
<para>calling from :</para>
<groupdata>
<para>1234567</para>
</groupdata>
<para>device model :</para>
<groupdata>
<para>ABC-123</para>
</groupdata>
<para>issue:</para>
<groupdata>
<para>some info</para>
<para>some more info</para>
<para>and even more info</para>
</groupdata>
<para>solution :</para>
<groupdata>
<para>some solutions</para>
<para>and some more solutions</para>
</groupdata>
</note>
What would be the most efficient approach (using xslt 2.0) ?

Answer 1

I think using xsl:for-each-group select="*" group-starting-with="*[ends-with(., ':')]" is straight-forward:
<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="note">
<xsl:copy>
<xsl:for-each-group select="*" group-starting-with="*[ends-with(., ':')]">
<xsl:copy-of select="."/>
<groupdata>
<xsl:copy-of select="current-group() except ."/>
</groupdata>
</xsl:for-each-group>
</xsl:copy>
</xsl:template>
</xsl:stylesheet>
Efficiency is something you would have to measure for each implementation.