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Using XSLT to transform XHTML to XHTML (again!)

From: WilliamRayer@-----------.---------.---
To: NULL
Date: 7/4/2008 8:44:00 AM


Dear Newsgroup

I have an input XHTML document containing multiple topics. It contains topic 
names in h1 tags followed by content elements at the same level, and I want 
the transform to be able to select a single topic as specified by a parameter 
and output the topic as valid XHTML. I'm OK with the parameter but I cannot 
figure out how to get just the topic I want. Here is the input:

------- input2.xhtml --------
<?xml version="1.0"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" 
  "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">  
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en">
  <head>
    <title>Fruits</title>
  </head>
  <body>
    <h1>Apples</h1>
    <p>Round fruits that grow on trees.</p>
    <p>They taste OK.</p>
    <h1>Bananas</h1>
    <p>Yellow fruits that grow in clumps.</p>
    <p>They taste nice as a smoothie.</p>
    <h1>Turnips</h1>
    <p>Warty vegetable, OK if roasted.</p>
  </body>
</html>
------- input2.xhtml --------


------- transform2.xslt ---------
<xsl:stylesheet version="1.0" 
 xmlns="http://www.w3.org/1999/xhtml"
 xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
 xmlns:xhtml="http://www.w3.org/1999/xhtml"
  exclude-result-prefixes="xhtml xsl">
 
  <xsl:output method="xml" indent="yes" omit-xml-declaration="yes" 
  doctype-public="-//W3C//DTD XHTML 1.0 Transitional//EN" 
  doctype-system="http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"/>

<xsl:param name="title"/>

<xsl:variable name="first">4</xsl:variable>

<xsl:variable name="last">6</xsl:variable>

<xsl:template match="/">
  <html>
  <head>
  <title> <xsl:value-of select="$title"/> </title>
  </head>
  <body> 
      
    <xsl:for-each select="xhtml:html//xhtml:h1|xhtml:html//xhtml:p">
        <xsl:if test="position() >= $first and position() <= $last">
          <xsl:copy-of select="."></xsl:copy-of>
        </xsl:if>
    </xsl:for-each>
      
  </body>
  </html>
</xsl:template>

</xsl:stylesheet>
------- transform2.xslt ---------


---- wanted-output.xhtml -----
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" 
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html 
xmlns="http://www.w3.org/1999/xhtml">
	<head>
		<title>Bananas</title>
	</head>
	<body>
		<h1>Bananas</h1>
		<p>Yellow fruits that grow in clumps.</p>
		<p>They taste nice as a smoothie.</p>
	</body>
</html>
---- wanted-output.xhtml -----

In this case I pass in "Bananas" as the 'title' parameter and I want my 
output to be just the topic associated with Bananas (eg the position() 
between 4 and 6). But the only way I can make it work is by hard-wiring the 
'first' and 'last' position values which is not useful :) In my transform I 
want something like:

<xsl:variable name="first" select="position-of(text()=$title)"/>
<xsl:variable name="last" select="position-of(text()=$title) and position() 
> $first"/>

But somehow I don't think that will work :) Any pointers would be welcome.

Kind regards, Will Rayer

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