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Re: Re: An issue with XPath 2.0 sequences (Was Re: RE: Muenchian method, and keys 'n stuff)
- From: Dimitre Novatchev <dnovatchev at yahoo dot com>
- To: xsl-list at lists dot mulberrytech dot com
- Date: Fri, 1 Feb 2002 01:51:18 -0800 (PST)
- Subject: [xsl] Re: Re: An issue with XPath 2.0 sequences (Was Re: RE: Muenchian method, and keys 'n stuff)
- Reply-to: xsl-list at lists dot mulberrytech dot com
> > Nevertheless, I'm reasonably comfortable with it.
>
> I think the place where it breaks down most spectacularly is when it
> is combined with the apparent desire to model SQL NUL values as ()
> using a list, even an empty one, as a value does not really combine
> with the non nested list model, which means that these "NUL" values
> vanish at interesting times and lead to strange anomalies in
> accumulation functions like sum() and the loss of the useful
lisp-like
> non-empty-node-set = true coercion that was in Xpath 1 but only
works
> in Xpath 2 "most of the time".
>
> David
Also as Jeni pointed out the weird case of sequences changing their
cardinality when mapped by a function that may return the null
sequence...
Dimitre.
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