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[xsl] Grouping

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I've been banging my head against a brick wall for a few days now. Having seen the level of expertise here, and given my own preliminary stumblings in xml and xslt, I feel a little foolish trying to poach some assistance when I really ought to be studying more, but I don't seem to be able to find any answers. I'd be very grateful for any assistance with the following problem:

I have the following XML:

<newsbriefs>
<item>
<date>2001-02-08</date>
<title>Newsletter No. 14</title>
<category type="news"/>
<jurisdiction name="All"/>
<summary>The Regie des Rentes has released an English version of La Lettre No. 14, which discusses the changes brought about by Bill 102.</summary>
<source>
<link href="http://www.rrq.gouv.qc.ca/an/prive/lettrercr/lettre14.htm">Newsletter</link>
</source>
<news/>
<backgrounders/>
<progress>
<first_reading/>
<second_reading/>
<third_reading/>
<royal_assent/>
<in_force/>
</progress>
<subjects>
<subject_ref reference="pensions"/>
<subject_ref reference="governance"/>
</subjects>
</item>
<item>
<date>2001-02-09</date>
<title>Labour Force statistics</title>
<category type="news"/>
<jurisdiction name="All"/>
<summary>Employment was virtually unchanged in January. The unemployment rate edged up 0.1 percentage points to 6.9%.</summary>
<source>
<link href="http://www.statcan.ca/Daily/English/010209/d010209a.htm">StatsCan Daily</link>
</source>
<news/>
<backgrounders/>
<progress>
<first_reading/>
<second_reading/>
<third_reading/>
<royal_assent/>
<in_force/>
</progress>
<subjects>
<subject_ref reference="general"/>
</subjects>
</item>

Many of the <item>s in my file have multiple <subject_ref> tags. I'm trying (with no success) to find a way to group them by subject_ref/@reference, but with no luck. I've gone through the archives, and found reference to a solution by Steve Muench involving the use of keys. I've (very unsuccessfully) tried to make the following work:

<xsl:key name="group" match="subject_ref" use="@reference"/>

[...]

<xsl:for-each select="//subject_ref[generate-id(.)=generate-id(key('group', @reference)[1])]">

[...]

Do I have a problem because of the fact that I have more than one <subject_ref > child for many of the <subjects> nodes in my xml?

I would really appreciate any pointers on how to make this work.

Chris D'Iorio
inRatio Inc.

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