Subject: [xsl] Re: Re: An issue with XPath 2.0 sequences (Was Re: RE: Muenchian method, and keys 'n stuff) From: Dimitre Novatchev <dnovatchev@xxxxxxxxx> Date: Fri, 1 Feb 2002 01:51:18 -0800 (PST) |
> > 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. __________________________________________________ Do You Yahoo!? Great stuff seeking new owners in Yahoo! Auctions! http://auctions.yahoo.com XSL-List info and archive: http://www.mulberrytech.com/xsl/xsl-list
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