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RE: RE: Muenchian technique, was (Keys on multiple el

Subject: RE: RE: Muenchian technique, was (Keys on multiple element types)
From: DPawson@xxxxxxxxxxx
Date: Tue, 5 Feb 2002 16:37:41 -0000
RE:  RE: Muenchian technique
Hi Jeni. One last go at this,
then I'll start to agree we may be at cross purposes.

> > I had this last week with 
> >
> > $variable[generate-id(.) = generate-id(key('rows', name)[1])]
> >
> > so here the ndl in $variable is 'searched' for the first node for
> > which the predicate is true? Then returned as the value of the
> > expression?
> Obviously it depends on the data, but the above expression should
> return more than one node in some circumstances - all those nodes in
> the $variable node set that are the first node (in document order)
> returned by calling the key with their name element child as the key
> value. 

Just testing understanding here. If it returns more than one node,
it implies that two (unique) id value pairs are equal, which (as you say)
implies that in two places in the source document the predicate is true,
which implies that the $variable has 'duplicates' (definition dependent
on source file). 

I (mistakenly) presumed that the above expression would return a single
node (fooled by the use of generate-id() I guess). 

The above explanation matches the symptoms I was seeing. I did a count()
on the guts of the above expression, and did a back flip when I found
a 2 in the output :-). I'm halfway there to understanding now.

Thanks for going that bit further.

Regards DaveP



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