[xsl] selecting nodes based on sibling values

Hi List.
Let's say I have an XML like below...

<data>
        <row>
                <level>40</level>
                <keycode>1254.45.12</keycode>
        </row>
        <row>
                <level>50</level>
                <keycode>1254.45.12.7</keycode>
        </row>
        <row>
                <level>50</level>
                <keycode>1254.45.12.8</keycode>
        </row>
        <row>
                <level>50</level>
                <keycode>1254.45.12.9</keycode>
        </row>

        <row>
                <level>40</level>
                <keycode>99.25.6</keycode>
        </row>
        <row>
                <level>50</level>
                <keycode>99.25.6.45</keycode>
        </row>
        <row>
                <level>50</level>
                <keycode>99.25.6.46</keycode>
        </row>
</data>

What could be the XPath expression to get the maximum number of nodes of
level=50 in data those keycode starts like the level=40 line ?
Here the answer would be 3 as the maximum number of level = 50 nodes for
a given level = 40 is 3
I have tried several things, but I am stuck....
(I am using XSLT 2.0 on Saxon)


Thanks for lending me some neurons...
Best regards,
Fabien



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