Re: [xsl] grouping problem

["G. Ken Holman" <gkholman@xxxxxxxxxxxxxxxxxxxx>]

At 2009-04-22 10:36 +0530, M Balaji wrote:
> I need to group the input.
>
> Input:
> <root>
>   <num>This chapter is..:</num>
>   <test>A class is a module of Java code:</test>
>   <section>or</section>
>   <title>Java 5.0</title>
>   <test>The Java programming language</test>
>   <p>Write Once, Run Anywhere.</p>
>   <num>Java j2ee</num>
>   <p>Broad Responsibilities:...</p>
>   <num>Job Description Perform Oracle...</num>
> </root>
>
> Expected output:
>
> <msgs>
>   <msg>
>      <num>This chapter is..:</num>
>      <import>
>         <test>A class is a module of Java code:</test>
>         <title>Java 5.0</title>
>         <section>or</section>

Are the above two lines supposed to be inverted?  I'm assuming not.

>         <test>The Java programming language</test>
>      </import>
>      <p>Write Once, Run Anywhere.</p>
>   </msg>
>   <msg>
>      <num>Java j2ee</num>
>      <p>Broad Responsibilities:...</p>
>   </msg>
>   <msg>
>      <num>Job Description Perform Oracle...</num>
>   </msg>
> </msgs>
>
> I tried with the below stylesheet.
>
> <xsl:template match="root">
> <msgs>
> <xsl:for-each-group select="*"
> group-starting-with="*[starts-with(name(), 'num')]">
> <msg>
> <xsl:apply-templates select="." mode="msg"/>
> <xsl:for-each-group select="current-group() except ."
> group-ending-with="test[last()]">
> <xsl:apply-templates select="." mode="msg"/>
> <import>
> <xsl:apply-templates select="current-group() except ." mode="msg"/>
> </import>
> </xsl:for-each-group>
> </msg>
> </xsl:for-each-group>
> </msgs>
> </xsl:template>
>
> Output received:-

The following is not the output I get with your stylesheet.

> <msgs>
>    <msg>
>       <num>This chapter is..:</num>
>       <import>
>          <test>A class is a module of Java code:</test>
>          <section>or</section>
>          <title>Java 5.0</title>
>          <test>The Java programming language</test>
>       </import>
>       <import><!--Import tag need to remove -->
>          <p>Write Once, Run Anywhere.</p>
>       </import>
>    </msg>
>    <msg>
>       <num>Java j2ee</num>
>       <import> <!-- import tag need to remove -->
>          <p>Broad Responsibilities:...</p>
>       </import>
>    </msg>
>    <msg>
>       <num>Job Description Perform Oracle...</num>
>    </msg>
> </msgs>
>
> Where I need to modify the stylesheet to get the expected output?

The first step is to get the intermediate results above, which is 
done with the following changes to your stylesheet:

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

<xsl:output indent="yes"/>

<xsl:template match="root">
<msgs>
<xsl:for-each-group select="*"
group-starting-with="*[starts-with(name(), 'num')]">
<msg>
<xsl:apply-templates select="." mode="msg"/>
<xsl:for-each-group select="current-group() except ."
group-ending-with="test[last()]">
<import>
<xsl:apply-templates select="current-group()" mode="msg"/>
</import>
</xsl:for-each-group>
</msg>
</xsl:for-each-group>
</msgs>
</xsl:template>

<xsl:template match="@*|node()" mode="msg">
  <xsl:copy>
    <xsl:apply-templates select="@*|node()"/>
  </xsl:copy>
</xsl:template>

</xsl:stylesheet>

... and then it can be seen how to fix the problem.  To fix the 
problem you need only wrap an <import> group when there is a <test> 
element inside, otherwise put out the group without the wrapper.

I hope the example below helps.

. . . . . . . . . . . Ken


T:\ftemp>type balaji.xml
<root>
  <num>This chapter is..:</num>
  <test>A class is a module of Java code:</test>
  <section>or</section>
  <title>Java 5.0</title>
  <test>The Java programming language</test>
  <p>Write Once, Run Anywhere.</p>
  <num>Java j2ee</num>
  <p>Broad Responsibilities:...</p>
  <num>Job Description Perform Oracle...</num>
</root>

T:\ftemp>call xslt2 balaji.xml balaji.xsl
<?xml version="1.0" encoding="UTF-8"?>
<msgs>
   <msg>
      <num>This chapter is..:</num>
      <import>
         <test>A class is a module of Java code:</test>
         <section>or</section>
         <title>Java 5.0</title>
         <test>The Java programming language</test>
      </import>
      <p>Write Once, Run Anywhere.</p>
   </msg>
   <msg>
      <num>Java j2ee</num>
      <p>Broad Responsibilities:...</p>
   </msg>
   <msg>
      <num>Job Description Perform Oracle...</num>
   </msg>
</msgs>
T:\ftemp>type balaji.xsl
<?xml version="1.0" encoding="US-ASCII"?>
<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform";
                version="2.0">

<xsl:output indent="yes"/>

<xsl:template match="root">
  <msgs>
    <xsl:for-each-group select="*"
                        group-starting-with="*[starts-with(name(), 'num')]">
      <msg>
        <xsl:apply-templates select="." mode="msg"/>
        <xsl:for-each-group select="current-group() except ."
                            group-ending-with="test[last()]">
          <xsl:choose>
            <xsl:when test="current-group()/self::test">
              <import>
                <xsl:apply-templates select="current-group()"
                                     mode="msg"/>
              </import>
            </xsl:when>
            <xsl:otherwise>
              <xsl:apply-templates select="current-group()"
                                   mode="msg"/>
            </xsl:otherwise>
          </xsl:choose>
        </xsl:for-each-group>
      </msg>
    </xsl:for-each-group>
  </msgs>
</xsl:template>

<xsl:template match="@*|node()" mode="msg">
  <xsl:copy>
    <xsl:apply-templates select="@*|node()"/>
  </xsl:copy>
</xsl:template>

</xsl:stylesheet>
T:\ftemp>rem Done!



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