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POXSLT 3-level grouping on attributes
 

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    <p>OK, I KNOW that variations on this have been asked and answered; I've been reading them all day, but I'm still stuck. So, here goes:</p> <p>I need to create a summary list in HTML from some XML.</p> <p>Given this XML:</p> <pre><code>&lt;Root&gt;&lt;!-- yes, I know I don't need a 'Root' element! Legacy code... --&gt; &lt;Plans&gt; &lt;Plan AreaID="1" UnitID="83"&gt; &lt;Part ID="9122" Name="foo" /&gt; &lt;Part ID="9126" Name="bar" /&gt; &lt;/Plan&gt; &lt;Plan AreaID="1" UnitID="86"&gt; &lt;Part ID="8650" Name="baz" /&gt; &lt;/Plan&gt; &lt;Plan AreaID="2" UnitID="26"&gt; &lt;Part ID="215" Name="quux" /&gt; &lt;/Plan&gt; &lt;Plan AreaID="1" UnitID="95"&gt; &lt;Part ID="7350" Name="meh" /&gt; &lt;/Plan&gt; &lt;/Plans&gt; &lt;/Root&gt; </code></pre> <p>I need to emit:</p> <pre><code>&lt;ol&gt; &lt;li&gt;Area 1: &lt;ol&gt;&lt;!-- units in Area 1 --&gt; &lt;li&gt;Unit 83: &lt;ol&gt; &lt;li&gt;Part 9122 (foo)&lt;/li&gt; &lt;li&gt;Part 9126 (bar)&lt;/li&gt; &lt;/ol&gt; &lt;/li&gt; &lt;li&gt;Unit 86: &lt;ol&gt; &lt;li&gt;Part 8650 (baz)&lt;/li&gt; &lt;/ol&gt; &lt;li&gt;Unit 95: &lt;ol&gt; &lt;li&gt;Part 7350 (meh)&lt;/li&gt; &lt;/ol&gt; &lt;/li&gt; &lt;/ol&gt;&lt;!-- /units in Area 1--&gt; &lt;/li&gt; &lt;li&gt;Area 2: &lt;ol&gt;&lt;!-- units in Area 2 --&gt; &lt;li&gt;Unit 26: &lt;ol&gt; &lt;li&gt;Part 215 (quux)&lt;/li&gt; &lt;/ol&gt; &lt;/li&gt; &lt;/ol&gt;&lt;!-- /units in Area 2--&gt; &lt;/li&gt; &lt;/ol&gt; </code></pre> <p>I have the outer grouping working -- I get top-level list elements for Area 1 and 2. But I can't get the sequences of Units in the Areas -- I either get no output, or repeating the same value. I haven't even got down to the Part level :-(</p> <p>I've been working on a stylesheet like this:</p> <pre><code>&lt;xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform" &lt;xsl:output method="html" indent="yes"/&gt; &lt;xsl:key name="kAreaID" match="Plan" use="@AreaID" /&gt; &lt;xsl:key name="kUnitID" match="Plan" use="@UnitID" /&gt; &lt;xsl:template match="/Root/Plans"&gt; &lt;html&gt;&lt;head&gt;&lt;title&gt;test grouping&lt;/title&gt;&lt;/head&gt; &lt;body&gt; &lt;ol&gt; &lt;xsl:for-each select="./Plan[generate-id(.) = generate-id( key( 'kAreaID', @AreaID )[1] )]" &gt; &lt;xsl:sort order="ascending" select="./@AreaID" /&gt; &lt;li&gt;Area &lt;xsl:value-of select="@AreaID"/&gt;: &lt;ol&gt; &lt;xsl:for-each select="key( 'kUnitID', @UnitID )"&gt; &lt;li&gt;Unit &lt;xsl:value-of select="@UnitID"/&gt;: &lt;ol&gt; &lt;li&gt;(Parts go here...)&lt;/li&gt; &lt;/ol&gt; &lt;/li&gt; &lt;/xsl:for-each&gt; &lt;/ol&gt; &lt;/li&gt; &lt;/xsl:for-each&gt; &lt;/ol&gt; &lt;/body&gt; &lt;/html&gt; &lt;/xsl:template&gt; &lt;/xsl:stylesheet&gt; </code></pre> <p>Any help is greatly appreciated!</p>
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    1. COThanks, this gets me much closer. I'm still having a bit of trouble -- the 2nd-level elements are repeating instead of grouping, so I get Area 1 Unit 83 Part 9122 Unit 83 Part 9126 Unit 86 Part 8650 instead of Area 1 Unit 83 Part 9122 Part 9126 Unit 86 Part 8650 but it's a lot closer than I was!
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    2. COOops, I see the comments don't format the same way as the post :(
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    3. CONo, comments format as plain text (but pointy brackets <> are allowed). Please check my modified solution. :)
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