[xsl] grouping problem

It seems that grouping always gives me trouble. Thanks in advance for  
any help you can give me.
Here is a snippet of my input xml:

<Root>
<State_Standard state="CA" g_code="G6U5S33">
<state>California Content Standards</state>
<SS>3.6 Narrative Analysis of Grade-Level-Appropriate Text: Identify  
and analyze features of themes conveyed through characters, actions,  
and images.</SS>
</State_Standard>

<State_Standard state="CA" g_code="G6U5S37">
<state>California Content Standards</state>
<SS>3.5 Narrative Analysis of Grade-Level-Appropriate Text: Identify  
the speaker and recognize the difference between first- and third- 
person narration (e.g., autobiography compared with biography).</SS>
</State_Standard>

<State_Standard state="CA" g_code="G6U6S52">
<state>California Content Standards</state>
<SS>3.4	Narrative Analysis of Grade-Level-Appropriate Text: Define  
how tone or meaning is conveyed in poetry through word choice,  
figurative language, sentence structure, line length, punctuation,  
rhythm, repetition, and rhyme.</SS>
</State_Standard>

<State_Standard state="CA" g_code="G6U5S33">
<state>California Content Standards</state>
<SS>3.2	Narrative Analysis of Grade-Level-Appropriate Text: Analyze  
the effect of the qualities of the character (e.g., courage or  
cowardice, ambition or laziness) on the plot and the resolution of  
the conflict.</SS>
</State_Standard>

<State_Standard state="DE" g_code="G6U4S27">
<state>Delaware Content Standards</state>
<SS>4.2a.4  Test and revise predictions as they read further</SS>
</State_Standard>

<State_Standard state="DE" g_code="G6U4S27">
<state>Delaware Content Standards</state>
<SS>4.2a.3  Make reasonable predictions as they read</SS>
</State_Standard>

<State_Standard state="DE" g_code="G6U4S26">
<state>Delaware Content Standards</state>
<SS>4.2a.1  Make strongly implied inferences about content and  
concrete ideas in a text and identify appropriate text support</SS>
</State_Standard>

</Root>

I am creating multiple state files using <xsl:result-document> and  
<xsl:for-each-group> grouping by @state. Then I am attempting to  
group on the @g_code so as to group <SS> elements whose parents have  
the same @g_code as in this example snippet based on  
g_code="G6U5S33" (text removed for display purposes:
<state>California Content Standards</state>	G6U5S33	<SS>3.6   
Narrative....</SS><SS>3.2  Narrative Analysis of....</SS>
Here is my current xslt (2.0)

<?xml version="1.0" encoding="UTF-8"?>
<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform";  
version="2.0">
    <xsl:output method="xml" indent="yes"/>

<xsl:template match="/">
        <xsl:for-each-group select="/Root/State_Standard"
                            group-by="@state">
            <xsl:sort select="current-grouping-key()"/>
            <xsl:variable name="stateName" select="current-group() 
[1]/@state"/>
            <xsl:result-document href="state_out/{$stateName}.txt">

                <xsl:for-each-group select="current-group()"
                                    group-by="@g_code">
                  <xsl:for-each select="current-group()/SS">
                    <xsl:copy-of select="preceding-sibling::state"/ 
><xsl:text>&#09;</xsl:text>
                    <xsl:value-of select="current-grouping-key()"/ 
><xsl:text>&#09;</xsl:text>
                    <SS><xsl:value-of select="current-group/SS"/></ 
SS><xsl:text>&#10;</xsl:text>
                  </xsl:for-each>
                </xsl:for-each-group>

            </xsl:result-document>
        </xsl:for-each-group>
    </xsl:template>
</xsl:stylesheet>


Here is a snippet of the output CA.txt file which shows that the  
group-by="g_code" does not seem to work as I hoped it would:
<state>California Content Standards</state>	G6U5S33	<SS>3.6 Narrative  
Analysis of Grade-Level-Appropriate Text: Identify and analyze  
features of themes conveyed through characters, actions, and images.</ 
SS>
<state>California Content Standards</state>	G6U5S33	<SS>3.2 Narrative  
Analysis of Grade-Level-Appropriate Text: Analyze the effect of the  
qualities of the character (e.g., courage or cowardice, ambition or  
laziness) on the plot and the resolution of the conflict.</SS>
Again, thanks in advance:

Terry

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