How to put sorted nodes into a variable? (to xsl:number a sorted node-se

hello all,

I'm trying to 'xsl:number' some sorted multileveled nodes.

According to some messages I found in the archive of this mailing list, I 
should
first put my sorted node-set into a xsl:variable. (Otherwise numbering will 
take place according
to the order of nodes in the xml document!).

To reproduce my struggle:

a)  xml input:

<thing sequenceIndex="30" key="hardware">
        <thing sequenceIndex="20" key="computerB">
        </thing>
        <thing sequenceIndex="5" key="computerA">
                <thing sequenceIndex="5" key="diskOne">
                </thing>
                <thing sequenceIndex="10" key="diskTwo">
                </thing>
        </thing>
<thing
<thing sequenceIndex="10" key="software">
</thing>

b) wished output: (sorted on attribute 'sequenceIndex')

1 software
2 hardware
2.1 computerA
2.1.1 diskOne
2.1.2 diskTwo
2.2 computerB

c) xsl

<xsl:variable name="sorted-things" select="//Thing">
        <!-- see question 1 below -->
</xsl:variable>

<xsl:for-each select="$sorted-things">
        <fo:block>
                <xsl:number level="multiple" grouping-size="1" 
grouping-separator="."/>
                <xsl:text> </xsl:text>
                <xsl:value-of select="@key"/>
        </fo:block>
</xsl:for-each>


Question 1: how to put sorted nodes into the variable ($sorted-things)? 
Sortation according to <xsl:sort select="@sequenceIndex" data-type="number" 
order="ascending"/>.
Question 2: is this "use a variable"-strategy correct to xsl:number a set of 
nodes according to their sortation (and not their xml document order)?
any help appreciated,

Mathieu van Echtelt
Groningen
the Netherlands

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