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[xsl] How to properly use Key elements


Subject: [xsl] How to properly use Key elements
From: "G. T. Stresen-Reuter" <tedmasterweb@xxxxxxxxx>
Date: Mon, 14 Oct 2013 01:41:18 +0100

Hi,

I've read (and reread) Jeni Tenison's description of Muenchian Grouping
several times and when my example is similar in structure to her example, I'm
able to use it quite effectively but when my source XML varies from her
example, I'm a bit lost.

I'm wondering if I can create a key to group on ShipName and/or RouteNum. As a
complication, I don't knowing anything more than the fact that ShipName is a
preceding sibling and that there will be 4 TD elements in rows that contain
ShipName.

XML

<table>
        <tbody>
                <tr>
                        <td rowspan="6">ShipName</td>
                        <td rowspan="3">RouteNum</td>
                        <td>PortName</td>
                        <td>PortCode</td>
                </tr>
                <tr>
                        <td>PortName</td>
                        <td>PortCode</td>
                </tr>
                <tr>
                        <td>PortName</td>
                        <td>PortCode</td>
                </tr>
                <tr>
                        <td rowspan="3">RouteNum</td>
                        <td>PortName</td>
                        <td>PortCode</td>
                </tr>
                <tr>
                        <td>PortName</td>
                        <td>PortCode</td>
                </tr>
                <tr>
                        <td>PortName</td>
                        <td>PortCode</td>
                </tr>

                { repeat rows }

        </tbody>
</table>


My question is if I can "legally" define a KEY element like this:

<xsl:key
        name="ports-by-ship"
        match="td[position() = (count(.) - 1)]"
        use="tr[count(td) = 4]/td[position() = 1]"
 />

The XSL spec says that "match" should be a "pattern" while "use" can be an
"expression". I'm not exactly sure what they mean by expression, how it is
different from a pattern match that uses a predicate.

I've been unable to get this to work but it sure would be handy if I could.

Thanks to anyone who can lend a hand. I've been off the list for years but
recently found myself (happily) doing some more xslt.

Sincerely,

Ted Stresen-Reuter


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