[xsl] An Interesting Wrinkle Re: [xsl] Revision Marking in HTML

[Nadia.Swaby@xxxxxx]

I found a new wrinkle!

If you are inserting several new block elements, this is what XMetal does:

<?xm-insertion_mark_start author="N. Swaby" time="20050426T110701-0500"?>
<para>This is new para1</para>
<para>This is new para2</para>
<?xm-insertion_mark_end?>

I was hoping that each individual block was surround by a pair of PIs.

I was thinking of using this for block elements:

<xsl:choose>
         <xsl:when
test="preceding-sibling::processing-instruction('xm-insertion_mark_start')
| following-sibling::processing-instruction('xm-insertion_mark_end')">
                  <div class="revcontrol">
                        <xsl:apply-templates/>
                  </div>
                  </xsl:when>
                  <xsl:otherwise>
                        <xsl:apply-templates />
                  </xsl:otherwise>
            </xsl:choose>

For text, I would use the code posted by Michael Kay earlier in the thread.

Any suggestions?

Nadia Swaby



                                                                                                                             
                      David Carlisle                                                                                         
                      <davidc@xxxxxxxx         To:      xsl-list@xxxxxxxxxxxxxxxxxxxxxx                                      
                      k>                       cc:                                                                           
                                               Subject: Re: [xsl] Revision Marking in HTML                                   
                      2005-04-26 08:40                                                                                       
                      Please respond                                                                                         
                      to xsl-list                                                                                            
                                                                                                                             
                                                                                                                             





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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