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[xsl] Grouping within sub elements

Subject: [xsl] Grouping within sub elements
From: "Steve W" <lsl@xxxxxxxxxxxxx>
Date: Sat, 29 Jan 2005 07:45:50 -0000
I have been trying to use the Muenchian method to group sub-elements within
a particular element.  So I have something like :

<BODY>
    <ITEM>
        <ID>AA</ID>
        <SUBITEM>1</SUBITEM>
        <SUBITEM>2</SUBITEM>
        <SUBITEM>1</SUBITEM>
        <SUBITEM>3</SUBITEM>
        <SUBITEM>2</SUBITEM>
    </ITEM>
    <ITEM>
        <ID>BB</ID>
        <SUBITEM>1</SUBITEM>
        <SUBITEM>4</SUBITEM>
        <SUBITEM>1</SUBITEM>
        <SUBITEM>4</SUBITEM>
        <SUBITEM>4</SUBITEM>
    </ITEM>
    <ITEM>
        <ID>CC</ID>
        <SUBITEM>2</SUBITEM>
        <SUBITEM>2</SUBITEM>
        <SUBITEM>3</SUBITEM>
        <SUBITEM>3</SUBITEM>
        <SUBITEM>2</SUBITEM>
    </ITEM>
</BODY>

If I was to group all the subitems, I'd use something like <xsl:key
name="subs" match="BODY/ITEM" use="SUBITEM" />.

Can I apply the same sort of logic within an item group,  to get some output
something like :

Item AA
Subitems 1, 2, 3
Item BB
Subitems 1,4
Item CC
Subitems 2, 3

I can't help thinking I'm missing something obvious but can't see it !

Thanks for all help.

Steve
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