[xsl] Re: Re: Re: Re: An issue with XPath 2.0 sequences (Was Re: RE: Muenchian method, and keys 'n stuff)

[Dimitre Novatchev <dnovatchev at yahoo dot com>]

> > That's very dangerous.  It means that if one were doing several
different 
> > mapping operations from the same sequence the results could might
be 
> > incorrectly aligned.
> 
> As things stand they will usually not be aligned, the sequence 
> resulting from running "for" over an input sequence is the flattened 
> concatenation of the sequences resulting from applying the body to 
> each item of the original sequence, so you have no indication of 
> which result item resulted from which input. If you need this (and I 
> would have thought that you normally would) then you have to ensure 
> that the body of the for constructs an element node around each 
> result so that you get a predicatble sequence back. But then you have

> a  sequence of nodes rather than a sequence of whatever type you 
> originally wanted....
> 
> I think that this is just going to lead to massive user confusion.
> 
> David

And as Mike recently mentioned, creating elements is an expensive
operation.

Dimitre.



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