[xsl] "not a node item" inside distinct-values

XSLT 2.0
XML Spy

I have the following snippet of xml:

        <item racknum="1" traynum="7" pocketnum="11" itemnum="176"
qty_ship="12">SQUASH BENNINGS GREEN TINT</item>
        <item racknum="1" traynum="7" pocketnum="12" itemnum="177"
qty_ship="42">SQUASH BLACK BEAUTY</item>
        <item racknum="1" traynum="7" pocketnum="13" itemnum="178"
qty_ship="18">SQUASH EARLY PROLIFIC STRAIGHT NECK</item>
        <item racknum="2" traynum="8" pocketnum="1" itemnum="179"
qty_ship="12">SQUASH EARLY SUMMER CROOKNECK</item>
        <item racknum="2" traynum="8" pocketnum="2" itemnum="180"
qty_ship="6">SWISS CHARD FORDHOOK GIANT</item>
        <item racknum="2" traynum="8" pocketnum="3" itemnum="183"
qty_ship="24">TOMATO CELEBRITY HYBRID</item>
        <item racknum="2" traynum="8" pocketnum="4" itemnum="204"
qty_ship="24">TOMATO FLAVOR KING HYBRID</item>
        <item racknum="2" traynum="8" pocketnum="5" itemnum="186"
qty_ship="30">WATERMELON CRIMSON SWEET</item>
        <item racknum="2" traynum="8" pocketnum="6" itemnum="205"
qty_ship="12">WATERMELON SUGAR BABY</item>


I want to get the largest @pocketnum for each @racknum, i.e. racknum = 1
largest pocketnum = 13, racknum = 2 largest pocketnum = 6

My XSLT is like this:

<xsl:for-each select="distinct-values(//item/@racknum)">
        <xsl:variable name="rack-num" select="."/>
        <xsl:variable name="pocket-num" select="//item[./@racknum =
$rack-num and position() = last()]"/>
        <p>Rack: <xsl:value-of select="$rack-num"/> max pocket:
<xsl:value-of select="$pocket-num"/></p>
</xsl:for-each>

I get an error "Error in XPath 2.0 expression Not a node item"

Oustide of the <xsl:for-each... I can use:
 
<xsl:value-of select="//item[./@racknum = 2 and position() =
last()]/@pocketnum"/>

and get the results I expect, i.e. 6.

This must have something to do with the context within the "for-each", but I
can't figure out how to get the information.

Any suggestions?

Rick


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