Hi

I'm quite new to XSL and I've run in to some trouble.


I have some data on an existing XML format:
<?xml version="1.0" standalone="yes"?>
<root>
<field>
    <name>MyField1</name>
    <dtype>string</dtype>
    <key>true</key>
</field>
<field>
    <name>MyField2</name>
    <dtype>int</dtype>
    <key>false</key>
</field>
<data>
    <name>MyField1</name>
    <class>Data1</type>
    <assembly>MyNameSpc.Juba</assembly>
</data>
<data>
    <name>MyField1</name>
    <class>Data2</type>
    <assembly>MyNameSpc.Juba</assembly>
</data>
<data>
    <name>MyField2</name>
    <class>Data3</class>
    <assembly>MyNameSpc.Juba</assembly>
</data>
</root>


Now, I want to transform this into something like this:
<?xml version="1.0" encoding="UTF-8"?>
<root>
 <fields>
   <field name="MyField1" dtype="string" key="true">
     <datainfo>
      <data class="Data1" assembly="MyNameSpc.Juba"/>
      <data class="Data2" assembly="MyNameSpc.Juba"/>
     </datainfo>
   </field>
   <field name="MyField2" dtype="int" key="false">
     <datainfo>
      <data class="Data3" assembly=="MyNameSpc.Juba"/>
     </datainfo>
   </field>
 <fields>
</root>

Here is my XSL so far:
<?xml version="1.0" encoding="UTF-8"?>
<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform" xmlns:fo="http://www.w3.org/1999/XSL/Format">
<xsl:template match="root">
 <root>
   <xsl:apply-templates select="field"/>
 </root>
</xsl:template>
<xsl:template match="field">
  <fields>
   <xsl:for-each select="field">
    <xsl:apply-templates select="field"/>
   </xsl:for-each>
  </fields>
</xsl:template>
<xsl:template match="field">
  <field>
   <xsl:attribute name="name"><xsl:value-of select="name"/></xsl:attribute>
   <xsl:attribute name="dtype"><xsl:value-of select="dtype"/></xsl:attribute>
   <xsl:attribute name="key"><xsl:value-of select="key"/></xsl:attribute>
   <xsl:apply-templates select="data"/>
  </field>
</xsl:template>

<xsl:template match="data">
  <datainfo>
    <xsl:for-each select="data">
      <xsl:apply-templates select="data"/>
    </xsl:for-each>
  </datainfo>
</xsl:template>

<xsl:template match="data">
    <xsl:attribute name="class"><xsl:value-of select="class"/></xsl:attribute>
    <xsl:attribute name="assembly"><xsl:value-of select="assembly"/></xsl:attribute>
</xsl:template>
</xsl:stylesheet>

This produces
<root>
 <fields>
   <field name="MyField1" dtype="string" key="true"/>
   <field name="MyField2" dtype="int" key="false"/>
 <fields>
</root>

So my problem here is how to get back up to the root node and get hold of the "data" elements which belongs to the current field name that I'm at. I know that there is something wrong with <xsl:apply-templates select="data"/> under the field element. I guess this is lost under the field element in the original XML element.

On top of that there should be some checking on that the current field name is equal to the name of the data element to be put under the current field.

Any help would be appreciated!

Cheers!

Firstly, it doesn't make sense to have two template rules that both say match="field". (Or match="data"). This is an error, though processors are allowed to ignore it and simply ignore the first rule.

Secondly, this is nonsense unless you have fields-within-fields-within-fields:

<xsl:template match="field">
  <fields>
   <xsl:for-each select="field">
    <xsl:apply-templates select="field"/>

Your template matches a field, the for-each then selects its children called field, and for each of these children the apply-templates processes the grandchildren called field...

Finally, to get from a field to a data element, you can't simply use

<xsl:apply-templates select="data"/>

That expects the data to be a child of the field. You need

<xsl:apply-templates select="/root/data[name=current()/name]"/>

Michael Kay
http://www.saxonica.com/
Author, XSLT Programmer's Reference and XPath 2.0 Programmer's Reference