Re: [xsl] using position() inside Muenchian groups?

On 14/10/08 1:18 PM, "G. Ken Holman" <gkholman(_at_)CraneSoftwrights(_dot_)com> 
wrote:

I'm thinking I could use Muenchian grouping to pull out all the PRDC
sub-fields for a record (and then all the DRCT, WRTR, etc), and I also know
how to use position() to access the corresponding sibling...


Actually, that isn't quite precise.  That isn't what position()
returns.  The function returns the current position within the set of
nodes in the scope of the instruction that used select=.


Fair enough, although in my case I know the FMPXMLRESULT doesn't contain any
text nodes between elements but even if it did then nth position within one
<COL/> set would line up with the nth position within the other <COL/> set
I'm interested in.

So I think your question cannot be answered without seeing more
details of your code.


I'm only at the stage of cargo culting at the moment :-( I estimate it would
take about 2 hours of fumbling in the dark to figure out just the Muenchian
grouping code, which could all be for naught if it turns out that position()
within the for-each for the keyed group is relative to the subset and not
the original set.

To clarify, say I have this XML

        <COL>
            <DATA>PRDC</DATA>
            <DATA>xxxx</DATA>
            <DATA>xxxx</DATA>
            <DATA>xxxx</DATA>
            <DATA>xxxx</DATA>
            <DATA>PRDC</DATA>
            <DATA>xxxx</DATA>
        </COL>

and whatever code is necessary to create a virtual selection that looks like

        <COL>
            <DATA>PRDC</DATA>
            <DATA>PRDC</DATA>
        </COL>

which I then use xsl:for-each to iterate over, would position() inside that
xsl:for-each give me 1,2 or 1,6?

I suspect the former, which means that this code:

 <xsl:variable name="p" select="position()"/>
 <xsl:value-of select="ancestor::fmp:ROW/fmp:COL[$crew_name]/fmp:DATA[$p]"/>

would output

    Alan Jones
    Big Cheese

from this source XML
        <COL>
            <DATA>Alan Jones</DATA>
            <DATA>Big Cheese</DATA>
            <DATA>Bill Smith</DATA>
            <DATA>Camera Guy</DATA>
            <DATA>Little Cheese</DATA>
            <DATA>Zachary Azimuth</DATA>
            <DATA>Dicky Dickens</DATA>
        </COL>

which is wrong for me because I wanted

    Alan Jones
    Zachary Azimuth

So I think your question cannot be answered without seeing more
details of your code.


I'm working on it :-) Hard to write code like this though because I don't
know if the wrong answers I'm getting is because I got a bug in my code, or
because it is simply impossible.

e.


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