--- nfo/perl/libs/XML/XUpdate/xupdate2xsl.xml	2003/05/01 20:39:54	1.1
+++ nfo/perl/libs/XML/XUpdate/xupdate2xsl.xml	2003/05/06 14:33:31	1.3
@@ -2,14 +2,19 @@
   
   <xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
   
-      <!--
+      <!--
+      
+      xupdate2xsl: Translate XML document from namespace 'xupdate' to 'xsl'.
+      
       Purpose of this XML Stylesheet is to implement a set of templates 
       to translate XUpdate lingo into an intermediate xslt stylesheet 
       which actually performs the update to the original xml document
-      in a second step.
+      in a second step.
+      
       The required glue code - written in Perl - is available in module 
-      XML::XUpdate::XSLT. Please have a look at this to port it to other
-      languages.
+      XML::XUpdate::XSLT. Please have a look at this in order to use 
+      this stylesheet from other bindings.
+      
       -->
       
       <xsl:output method="xml" />
@@ -21,11 +26,31 @@
       <!-- override some builtin rules: see http://www.w3.org/TR/xslt#built-in-rule -->
       <xsl:template match="comment()"><xsl:call-template name="passthru" /></xsl:template>
   
+      
       <!-- 2. This is the translation part: XUpdate becomes XSLT -->
       
-      <!-- This node "encapsulates" common infrastructure. -->
+      <!-- lib -->
+      <!-- This node "encapsulates" common core infrastructure. -->
       <xsl:template match="xupdate:modifications">
   
+        <!-- <xsl:template name="identity_template_rule"> -->
+        <xsl:element name="xsl:template">
+          <xsl:attribute name="name">identity_template_rule</xsl:attribute>
+
+              <!-- An "identity template rule" - original version by Mike Kay, Software AG -->
+              <!-- Please visit [http://p2p.wrox.com/archive/xslt/2001-06/98.asp] -->
+              <!-- Translated to "self hosting xsl": Andreas Motl, andreas.motl@ilo.de -->
+              <!-- FIXME: Could this be used to replace passthru-logic at 1. ? -->
+              <xsl:element name="xsl:copy">
+                <xsl:element name="xsl:copy-of">
+                  <xsl:attribute name="select">@*</xsl:attribute>
+                </xsl:element>
+                <xsl:element name="xsl:apply-templates" />
+              </xsl:element>
+
+        </xsl:element>
+        <!-- </xsl:template> -->
+
           <!-- 1. This is the passthru logic (copy all untouched nodes). -->
           <!-- in fact this is the xsl from above translated to be able to be generated by xsl itself! -->
               <xsl:comment> 1. passthru logic </xsl:comment>
@@ -34,7 +59,8 @@
                   <xsl:element name="xsl:copy"><xsl:element name="xsl:apply-templates" /></xsl:element>
               </xsl:element>
               <xsl:element name="xsl:template">
-                  <xsl:attribute name="match">*</xsl:attribute>
+                  <!-- <xsl:attribute name="match">*</xsl:attribute> -->
+                  <xsl:attribute name="match">*ab</xsl:attribute>
                   <xsl:element name="xsl:call-template"><xsl:attribute name="name">passthru</xsl:attribute></xsl:element>
               </xsl:element>
               <xsl:element name="xsl:template">
@@ -47,15 +73,70 @@
   
       </xsl:template>
   
+
+
+
+
+      <!-- code -->
       <!-- This node "encapsulates" infrastructure for handling the directives. -->
+      <!-- FIXME: handle the other ones: append, remove, etc. -->
       <xsl:template match="xupdate:insert-after">
           <xsl:comment> 2. context finder </xsl:comment>
-          <xsl:apply-templates />
+          <!-- <xsl:variable name="select" select="@select">Hello World!</xsl:variable> -->
+          
+          <!-- this resembles some parts of the CRUD API - retranslated to self-hosting xsl -->
+
+          <!-- V1 -->
+          <!-- <xsl:element name="xsl:template"> -->
+              <!-- <xsl:attribute name="match"><xsl:value-of select="@select" /></xsl:attribute> -->
+
+          <!-- V2 -->
+          <xsl:element name="xsl:template">
+              <xsl:attribute name="match">*</xsl:attribute>
+              <!-- <xsl:attribute name="match">/addresses/address</xsl:attribute> -->
+              <!-- <xsl:attribute name="match"><xsl:value-of select="@select" /></xsl:attribute> -->
+
+          <xsl:element name="xsl:choose">
+              <!-- <xsl:attribute name="match"><xsl:value-of select="@select" /></xsl:attribute> -->
+            <xsl:element name="xsl:when">
+              <!-- <xsl:attribute name="test"><xsl:value-of select="@test" /></xsl:attribute> -->
+              <xsl:attribute name="test"><xsl:value-of select="@select" /></xsl:attribute>
+
+              <!-- FIXME: case "insert-before"!!! -->
+              <!-- <xsl:apply-templates /> -->
+
+              <!-- call the "identity template rule" to passthru all childnodes -->
+              <xsl:element name="xsl:call-template">
+                <xsl:attribute name="name">identity_template_rule</xsl:attribute>
+                <!-- <xsl:attribute name="name">passthru</xsl:attribute> -->
+              </xsl:element>
+
+              <!-- FIXME: case "insert-after"!!! -->
+              <xsl:apply-templates />
+
+            </xsl:element>
+            <xsl:element name="xsl:otherwise">
+
+              <!-- call the "identity template rule" to passthru all childnodes -->
+              <xsl:element name="xsl:call-template">
+                <xsl:attribute name="name">identity_template_rule</xsl:attribute>
+                <!-- <xsl:attribute name="name">passthru</xsl:attribute> -->
+              </xsl:element>
+
+              <!-- <xsl:apply-templates /> -->
+
+            </xsl:element>
+
+          </xsl:element>
+          </xsl:element>
+          
+          <!-- <xsl:apply-templates /> -->
+          
       </xsl:template>
   
       <!-- This node passes through all attributes and childnodes rewriting the tagname only. -->
       <xsl:template match="xupdate:element">
-          <xsl:comment> 3. rewrite / vivify elements/attributes </xsl:comment>
+          <xsl:comment> 3.a. vivify elements </xsl:comment>
           <xsl:element name="xsl:element">
               <xsl:copy-of select="@*"/>
               <xsl:apply-templates />
@@ -64,6 +145,7 @@
   
       <!-- This node passes through all attributes and childnodes rewriting the tagname only. -->
       <xsl:template match="xupdate:attribute">
+          <xsl:comment> 3.b. vivify attributes </xsl:comment>
           <xsl:element name="xsl:attribute">
               <xsl:copy-of select="@*"/>
               <xsl:apply-templates />