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Setting Attributes from Key value

Subject: Setting Attributes from Key value
From: "Berg, Eric" <eric.berg@xxxxxxxxxx>
Date: Tue, 21 Aug 2007 12:25:50 -0400
 Setting Attributes from Key value
Hey, folks.

I've got a bunch of XML that I need to transform, and it seems a little
tricky to me.  Let me lay out the problem.

I have a bunch of Attribute-Format elements in an
Attribute-FormatCollection.  Each one has a Key attribute.

These Attribute-Format elements are referred to by a bunch of Grouping
elements contained within a Grouping Collection element. The Key
attribute in the Grouping elements contains the same value as the Key
attribute in the Attribute-Format element to which it is referring.

An example snippet:

         <Attribute-Format Key="Cusip"/>
         <Attribute-Format Key="ModOADuration" />
         <Attribute-Format Key="PriceMktConv"/>

         <Grouping ColIndex="0" Index="1" Is-Grouped="0"
         <Grouping ColIndex="2" Index="0" Is-Grouped="0"
Key="ModOADuration" />
         <Grouping ColIndex="3" Index="3" Is-Grouped="0"
Key="OtherUselessJunk" />
         <Grouping ColIndex="3" Index="2" Is-Grouped="0"
Key="PriceMktConv" />

There are two things I need to do based on the results of matching the
Grouping with the Attribute-Format.

1) If there is no matching Attribute-Format for the Grouping, the
Grouping element should simply be deleted.

2) If there is a corresponding Attribute-Format match for the Grouping,
the Grouping[@ColIndex] must be set to the zero-offset index of the
Attribute-Format element within the Attribute-Format-Collection element.

So far, I've set up a key to hold the Attribute-Format elements, keyed
on the Key attribute, and I've managed to use that to identify those
Grouping elements that have valid Attributre-Format Key's.

What I have not been able to do so far is to fill out the ColIndex
attribute of the new Grouping element with  the offset of the
corresponding Attribute-Format element in the
Attribute-Format-Collection element.  Here's what I have so far.  I've
included both unsuccessful attempts at using xsl:value-of to retrieve
the right offset value with which to populate the ColIndex.

<?xml version="1.0" encoding="utf-8"?>
<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
  <xsl:output method="xml" indent="yes"/>
  <xsl:strip-space elements="*"/>

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

  <xsl:key name="attribute-format-by-key" match="Attribute-Format"
use="@Key" />

  <xsl:template match="//Grouping-Collection/Grouping">
    <xsl:copy select=".">
      <xsl:if test="key('attribute-format-by-key', @Key)" >
        <xsl:attribute name="ColIndex">
          <xsl:value-of select="key('attribute-format-by-key',
@Key)[@ColIndex]" />
at[@Key=@Key][@ColIndex]" />


Anybody have any ideas about how to approach this problem?



Eric D. Berg
Lehman Brothers
> Fixed Income Research
> 745 7th Avenue, 15th floor
> New York, NY 10019
> Phone +1 212 526 8118
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