RE: [xsl] XML to XML transformation

[Subramanian Subramanian <subramanian dot subramanian at integral dot com>]

Ken,

Thank you very much for explaining the elegant solution.

Subramanian

-----Original Message-----
From: G. Ken Holman [mailto:gkholman@CraneSoftwrights.com]
Sent: Friday, August 02, 2002 12:00 PM
To: xsl-list@lists.mulberrytech.com
Subject: RE: [xsl] XML to XML transformation


At 2002-08-02 11:19 -0700, Subramanian Subramanian wrote:
>How can I maintain a map of java class name to output element
>name in the XSL and use the map to generate the output element
>name whenever I find a xsi:type attribute in the input xml.
>
>Example
>         Class                                   output element name
>         com.integral.Car.BMW            bmwCar
>         com.integral.Car.Buick          buickCar

Not many users of XSLT realize you can build such tables into your 
stylesheet using a namespace local to the stylesheet instance.

In the example below I build a table of the mappings and initialize a 
variable to contain all the members of the table ... I can then just 
"index" into the table by the attribute, to give me the element type (i.e. 
name) of the result tree node.

Another option would be to separate the table out to a stand-alone instance 
so that the maintenance of the table is separate from the maintenance of 
your stylesheet ... but you may want to have everything encapsulated in a 
single file.

Note that the empty string argument to the document() function returns the 
root of the node tree of the stylesheet as if it were a source tree instead 
of a stylesheet tree.

I hope this helps.

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


T:\ftemp>type subramanian.xml
<cars>
   <javaobject xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance";
         xsi:type="java:com.integral.Car.BMW" attr1="123">
     <another-test/>
   </javaobject>
   <javaobject xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance";
         xsi:type="java:com.integral.Car.Buick">
     <another-test/>
   </javaobject>
<!--end of test-->
</cars>

T:\ftemp>type subramanian.xsl
<?xml version="1.0" encoding="iso-8859-1"?>
<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform";
                 xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance";
                 xmlns:classtypes="dummy"
                 exclude-result-prefixes="xsi classtypes"
                 version="1.0">

<classtypes:mappings> <!--table of mappings from class string to type
name-->
   <map class="java:com.integral.Car.BMW" type="bmwCar"/>
   <map class="java:com.integral.Car.Buick" type="buickCar"/>
</classtypes:mappings>

<xsl:variable name="maps" select="document('')/*/classtypes:mappings/map"/>

<xsl:template match="@xsi:*"/><!--suppress all attributes in XSI
namespace-->

<xsl:template match="*[@xsi:type]"><!--elements of an XS type-->
   <xsl:element name="{$maps[@class=current()/@xsi:type]/@type}">
     <xsl:apply-templates select="@*|node()"/>
   </xsl:element>
</xsl:template>

<xsl:template match="*"> <!--synthesize element with the input name-->
   <xsl:element name="{name(.)}" namespace="{namespace-uri(.)}">
     <xsl:apply-templates select="@*|node()"/>
   </xsl:element>
</xsl:template>

<xsl:template match="@*"> <!--synthesize attribute with the input name-->
   <xsl:attribute name="{name(.)}" namespace="{namespace-uri(.)}">
     <xsl:value-of select="."/>
   </xsl:attribute>
</xsl:template>

<xsl:template match="comment()|processing-instruction()">
   <xsl:copy/>
</xsl:template>

</xsl:stylesheet>

T:\ftemp>xt subramanian.xml subramanian.xsl
<?xml version="1.0" encoding="utf-8"?>
<cars>
   <bmwCar attr1="123">
     <another-test/>
   </bmwCar>
   <buickCar>
     <another-test/>
   </buickCar>
<!--end of test-->
</cars>
T:\ftemp>rem Done!


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