Built in templates and issues getting the XSLT process

Thanks again to Ken Holman and Wendell Piez for their response to my
previous posting.

To try and get a better understanding of the XSLT processing model and
built in templates, I have have read sections of Doug Tidwell's XSLT and
Jeni Tennison's Beginning XSLT 2.0: From Novice to Professional.

Then I ran a stylesheet without templates and a stylesheet that has only

a single template, which matches a single type of element deep in
the tree.

I think the following built in template for elements:

<xsl:template match="*">
  <xsl:apply-templates />
</xsl:template>

A match pattern of "*" matches all elements, ensuring the root node and
its children were processed.

Then the built-in template for text nodes ensured any text was output:

<xsl:template match="text()">
  <xsl:value-of select="." />
</xsl:template>

Recursive processing appeared to continue, even when there was no
template declared for an element.

Then I tried processing an input xml

<?xml version='1.0'?>
<a> Text a
  <b> Text b
    <c> Text c </c>
  </b>
  <x> Text x
    <y> Text y
      <z> Text z </z>
    </y>
  </x>
</a>

With the following stylesheet:

<?xml version='1.0'?>
<xsl:stylesheet version="2.0"
xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
<xsl:output method="xml" indent="yes"/>

<xsl:template match="c">
   <boo>
     <xsl:apply-templates/>
   </boo>
</xsl:template>

<xsl:template match="z">
   <bah>
     <xsl:apply-templates/>
   </bah>
</xsl:template>
</xsl:stylesheet>


The following was output:

<?xml version="1.0" encoding="UTF-8"?>
Text a
Text b
<boo> Text c </boo>
Text x
Text y
<bah> Text z </bah>


When the XSLT processor can't find a template to match the node that
it's been told to process, it uses a built-in template. So the
unexpected text a, b, x and y is due to built-in templates.

However, I am still having issues with getting the XSLT processor to
navigate an the input document to create a result.

Using a simple input document:

<?xml version='1.0'?>
<a> Text a
  <b> Text b
    <c> Text c </c>
  </b>
  <x> Text x
    <y> Text y
      <z> Text z </z>
    </y>
  </x>
</a>

A stylesheet to navigate to element c

<?xml version='1.0'?>
<xsl:stylesheet version="2.0"
xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
<xsl:output method="xml" indent="yes"/>

<xsl:template match="/">
  <xsl:message> found root </xsl:message>
    <xsl:apply-templates select="a/b"/>
</xsl:template>

<xsl:template match="a/b">
  <xsl:message> b found </xsl:message>
    <xsl:apply-templates select="a/b/c"/>
    <xsl:apply-templates/>
</xsl:template>

<xsl:template match="a/b/c">
  <xsl:message> c found </xsl:message>
    <xsl:apply-templates/>

</xsl:template>
</xsl:stylesheet>

The XSLT processor sends the following messages:

Found root
b found
c found

Whereas when I attempt the same navigation using my xml
(here a the start of the source xml):

<?xml version="1.0" encoding="UTF-8"?>
<Subject_Area_and_Entity_Groups
xmlns:UDP="http://www.ca.com/erwin/metadata"

xmlns:EMX="http://www.ca.com/erwin/data">
   <Subject_Area_Groups xmlns="http://www.ca.com/erwin/data"
xmlns:EM2="http://www.ca.com/erwin/EM2data">
      <Subject_Area id="{39146A35-A713-4CAA-9FBF-9AA575FA9F44}+0000001F"
name="&lt;Main Subject Area&gt;">
         <Subject_AreaProps>
            <Built-in_Id>31</Built-in_Id>
            <Definition/>
            <Name>&lt;Main Subject Area&gt;</Name>
.
.
.

With the following xslt:

<?xml version='1.0'?>
<xsl:stylesheet version="2.0"

xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
xpath-default-namespace="http://www.ca.com/erwin/data">
<xsl:output method="xml" indent="yes"/>

<xsl:key name="entity-id"
match="Subject_Area_and_Entity_Groups/Entity_Groups/Entity" use="@id"/>

<xsl:template match="/">
  <xsl:message> root found </xsl:message>
  <xsl:apply-templates
select="Subject_Area_and_Entity_Groups/Subject_Area_Groups"/>
</xsl:template>

<xsl:template
match="Subject_Area_and_Entity_Groups/Subject_Area_Groups">
  <xsl:message> Subject_Area_Groups found </xsl:message>
  <Subject_Areas>
    <xsl:apply-templates select="Subject_Area"/>
  </Subject_Areas>
</xsl:template>

<xsl:template match="Subject_Area">
 <Subject_Area>
  <xsl:value-of select="@name"/>

  <xsl:for-each
select="Subject_AreaProps/Referenced_Entities_Array/Referenced_Entities"
>
    <included-table>
     <xsl:value-of select="key('entity-id', @id )"/>
    </included-table>
  </xsl:for-each>

 </Subject_Area>
</xsl:template>

</xsl:stylesheet>

The only message output by the XSLT processor is:

root found.

I was expecting to see:

root found
Subject_Area_Groups found


I would be interested to know if you have any comments on the above or
if you know how can the above results be explained?

Best regards,

Mike
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