[XSL-LIST Mailing List Archive Home] [By Thread] [By Date] [Recent Entries] [Reply To This Message]

Grouping by character runs (and keeping element struc

Subject: Grouping by character runs (and keeping element structure)
From: "Christian Roth" <roth@xxxxxxxxxxxxxx>
Date: Thu, 27 Jul 2006 12:34:33 +0200
ul marker
Continuing my grouping issues: 

XSLT2 handles grouping on a node level quite conveniently. However,
adding structure to legacy, rather flat content (i.e.: character runs)
still poses challenges in grouping. The following applies mainly to
document-centric (as opposed to data-centric) XML.

__ EXAMPLE 1 __

<p>Note #4: Don't tumble dry your pet.</p>

TASK:
Group the leading paragraph text "Note #4:" using <marker> so that the
result looks like (indented for readibility):

<p><marker>Note #4:</marker>
   Don't tumble dry your pet.</p> 

SOLUTION:
The solution is easy, as we can just work on the text without having to
worry about markup:

<?xml version="1.0" encoding="UTF-8"?>
<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
version="2.0">

  <xsl:template match="p">
    <xsl:copy>
      <xsl:analyze-string select="." regex="^Note\s#\d+:">
        <xsl:matching-substring>
          <marker>
            <xsl:value-of select="." />
          </marker>
        </xsl:matching-substring>
        <xsl:non-matching-substring>
          <xsl:value-of select="normalize-space(.)" />
        </xsl:non-matching-substring>
      </xsl:analyze-string>
    </xsl:copy>
  </xsl:template>
</xsl:stylesheet>


However, in "real" documents, you will have likely something like this:


__ EXAMPLE 2 __

<p><b>Note</b> <i>#4</i>: Don't tumble dry your pet.</p>

TASK:
Group the leading paragraph text "Note #4:" including any contained
markup using <marker> so that the result looks like:

<p><marker><b>Note</b> <i>#4</i>:</marker>
   Don't tumble dry your pet.</p> 

SOLUTION:
Here it starts to get really complicated. Since now the text will
contain markup we need to retain, but the text run is still to be
considered from the <p> level (so that we can test for "starts with
pattern" using '^'), <xsl:analyze-string/> does not seem to do the trick
in this case.

A worst-case scenario of course would be:


__ EXAMPLE 3 __

<p><ul><b>Note</b> <i>#4</i>: Don't tumble dry your pet</ul>.</p>

TASK:
Group the leading paragraph text "Note #4:" including any contained
markup using <marker> to a child of <p> so that the result looks like:

<p><marker><ul><b>Note</b> <i>#4</i>:</ul></marker>
   <ul>Don't tumble dry your pet</ul>.</p> 

SOLUTION: 
Same problems as in EXAMPLE 2, but additionally note that the <ul>
element must be split/duplicated so that <marker> can be a child of <p>,
yet retains the full formatting info in form of the contained element
structure.


Is there a certain pattern on how to tackle these kind of problems in
XSLT, or is the language just not the tool of choice for this kind of
transformation?


-Christian

Current Thread

PURCHASE STYLUS STUDIO ONLINE TODAY!

Purchasing Stylus Studio from our online shop is Easy, Secure and Value Priced!

Buy Stylus Studio Now

Download The World's Best XML IDE!

Accelerate XML development with our award-winning XML IDE - Download a free trial today!

Don't miss another message! Subscribe to this list today.
Email
First Name
Last Name
Company
Subscribe in XML format
RSS 2.0
Atom 0.3
Site Map | Privacy Policy | Terms of Use | Trademarks
Free Stylus Studio XML Training:
W3C Member
Stylus Studio® and DataDirect XQuery ™are products from DataDirect Technologies, is a registered trademark of Progress Software Corporation, in the U.S. and other countries. © 2004-2013 All Rights Reserved.