[xsl] Grouping to Separate Out Block Level Elements from Mixed Content

["Don Smith dsmith_lockesmith@xxxxxxxxx" <xsl-list-service@xxxxxxxxxxxxxxxxxxxxxx>]

The sample XML file has two paragraphs ("p" element) that contain mixed
content. However, some of the child elements of "p" are block level elements.
I need to separate these block level elements out from the mixed content and
place each component of the paragraph content in their own consecutive blocks,
as appropriate. So, in the first example input paragraph (see attached for
complete input file):B <p>In Boolean algebra, the algebraic normal form
<i>(ANF)</i> is a way of writing logical formulas inB  B  one of three
subforms: <list list-type="simple">B  B  B <list-item>B  B  B  <p>The entire
formula is purely true or false</p>B  B  B </list-item>B  B  B <list-item>B 
B  B  <p>One or more variables are ANDed together into a term</p>B  B 
B </list-item>B  B  B <list-item>B  B  B  <p>The previous subform with a
purely true term</p>B  B  B </list-item>B  B  </list>Formulas written in ANF
are also known as Zhegalkin polynomials and Positive Polarity (orB  B  Parity)
ReedbMuller expressions (PPRM).</p>
Should on output be:
<p>In Boolean algebra, the algebraic normal form <i>(ANF)</i> is a way of
writing logical formulas inB  B  one of three subforms:<p>B <list
list-type="simple">B  B  B <list-item>B  B  B  <p>The entire formula is purely
true or false</p>B  B  B </list-item>B  B  B <list-item>B  B  B  <p>One or
more variables are ANDed together into a term</p>B  B  B </list-item>B  B 
B <list-item>B  B  B  <p>The previous subform with a purely true term</p>B  B 
B </list-item>B  B  </list><p>Formulas written in ANF are also known as
Zhegalkin polynomials and Positive Polarity (orB  B  Parity) ReedbMuller
expressions (PPRM).</p>
You'll note in the second example input paragraph a more complex scenario
where there are two nested block elements. I think a recursive solution is
needed for that but so far I've had no success in achieving it.
The XSLT I've written so far (attached) accomplishes the first needed part by
separating the block elements from the mixed content that comes before the
block using for-each-group and group-starting-with. But attempts to achieve
the same result on mixed content that follows the block
usingB B for-each-group and group-ending-with have not succeeded. I think it's
close but am just missing a crucial detail.B And, as noted already, the
solution does need to account for the possibility of nested blocks.
Embedded XSLT:
<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform"B  B 
xmlns:xs="http://www.w3.org/2001/XMLSchema"B  B 
xmlns:xlink="http://www.w3.org/1999/xlink"B B  B 
xmlns:mml="http://www.w3.org/1998/Math/MathML"B  B 
exclude-result-prefixes="xs"B  B  version="2.0">B  B  B  B B B  B 
<xsl:template match="p">B  B  B  B  <xsl:for-each-group select="node()"
group-starting-with="list | disp-formula | mml:math">B  B  B  B  B  B 
<xsl:variable name="group1" as="element()">B  B  B  B  B  B  B  B  <GROUP1>B 
B  B  B  B  B  B  B  B  B  <xsl:apply-templates
select="current-group()"></xsl:apply-templates>B  B  B  B  B  B  B  B 
</GROUP1>B  B  B  B  B  B  </xsl:variable>B  B  B  B  B  B  <xsl:choose>B  B 
B  B  B  B  B  B  <xsl:when test="$group1/list |B B  B  B  B  B  B  B  B  B 
B  $group1/disp-formula |B  B  B  B  B  B  B  B  B  B  $group1/mml:math">B  B 
B  B  B  B  B  B  B  B  <xsl:call-template name="end_group">B  B  B  B  B  B 
B  B  B  B  B  B  <xsl:with-param name="input" select="$group1"/>B  B  B  B 
B  B  B  B  B  B  </xsl:call-template>B  B  B  B  B  B  B  B  </xsl:when>B  B 
B  B  B  B  B  B  <xsl:otherwise>B  B  B  B  B  B  B  B  B  B  <xsl:copy-of
select="$group1"/>B  B  B  B  B  B  B  B  B  B B B  B  B  B  B  B  B  B 
</xsl:otherwise>B  B  B  B  B  B  </xsl:choose>B  B  B  B 
</xsl:for-each-group>B  B  </xsl:template>B  B B  B  <xsl:template
name="end_group">B  B  B  B  <xsl:param name="input" >default</xsl:param>B  B 
B  B  <xsl:variable name="group2" as="element()" >B  B  B  B  B  B 
<xsl:for-each-group select="$input" group-ending-with="list | disp-formula |
mml:math">B B B  B  B  B  B  B  B  B  <PGROUP2>B  B  B  B  B  B  B  B  B  B 
<xsl:apply-templates select="current-group()"></xsl:apply-templates>B  B  B 
B  B  B  B  B  </PGROUP2>B  B  B  B  B  B  B  B  B  B B B  B  B  B  B  B 
</xsl:for-each-group>B  B  B  B  </xsl:variable>B  B  B  B  <xsl:copy-of
select="$group2"/>B  B  B  B B B  B  </xsl:template>
B  B  <xsl:template match="/">B  B  B  B  <output>B  B  B  B  B  B 
<xsl:apply-templates/>B  B  B  B  </output>B  B  </xsl:template>B  B B B  B 
<xsl:template match="*">B  B  B  B  <xsl:variable name="name" as="xs:string"
select="name()"/>B  B  B  B  <xsl:element name="{$name}">B  B  B  B  B  B 
<xsl:apply-templates/>B  B  B  B  B  B B B  B  B  B  </xsl:element>B  B 
</xsl:template>B  B B B  B B </xsl:stylesheet>
Thanks in advance,
Don

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