[xsl] Grouping and sorting nodes by the values of the 2 elem

Hi everyone,

I'm trying to process the following XML file:

<----------XML-------------------------------->

<root>
	<Bugs>
		<Bug>
			<Category1>aaa</Category1>
			<Category2>111</Category2>
			<Description>Some text</Description>
		</Bug>
		<Bug>
			<Category1>aaa</Category1>
			<Category2>222</Category2>
			<Description>Some text</Description>
		</Bug>
		...
	</Bugs>
</root>

<----------XML-------------------------------->



... where Cat2 is a subcategory of Cat1.


What I need is to get in the output is this:


<----------HTML-------------------------------->

<H1>aaa</H1>

    <H2>111<H2>
    <p>Some text</p>
    ...

    <H2>222<H2>
    <p>Description text2</p>
    ...

<H1>bbb</H2>

    <H2>333<H2>
    <p>Some text</p>

<----------HTML-------------------------------->


So all Bugs should be sorted by Category1, then by Category2, but i don't want 
to output the value of Category1 for each Bug.

The second issue is that I need to generate a linked table of contents based 
on Category1 element values:

-------------
Contents
	aaa
        bbb
	ccc
--------------

Below is part of the XSL that I already have, and which outputs both cat1 and 
cat2 (sorted) for each Bug node.

Someone please have a quick look at this - thanks!

Armin


<----------XSL-------------------------------->

<xsl:template match="root">
   <html>
      <body>
<xsl:apply-templates select="Bugs/Bug">
		<xsl:sort select="Category1" order="ascending" />
		<xsl:sort select="Category2" order="ascending" />      
</xsl:apply-templates>

                        
</body>
</html>


</xsl:template>

<xsl:template match="Bug">

 	<span >
         <p>
            <a name="Type"><xsl:value-of select="Category1"/></a></p>
	 <p><xsl:value-of select="Category2"/></p></span>

  <div>
	<p><xsl:value-of select="Description"/></p></div>

</xsl:template>


<----------XSL-------------------------------->



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[xsl] Grouping and sorting nodes by the values of the 2 elements, and displaying only 1 in the HTML output