Re: [xsl] flatened hiearchies for xslt2

["Dimitre Novatchev" <dnovatchev@xxxxxxxxx>]

On 3/8/07, David Carlisle <davidc@xxxxxxxxx> wrote:
> > unless Saxon performs some smart optimization.  What do you think ?
>
> even if you don't use a key saxon (perhaps  just in the -sa version, I
> can't remember) may decide you use some //foo[@x='aa'] idiom often
> enough to internally use a key anyway. I tend to think of for-each group
> as a sane syntax added at xslt2 for the muenchian grouping idiom that
> Dimitre showed, which works well, but only looks normal as its posted
> once a week for over half a decade to this list:-). No idea if the
> internal implementations are similar though but that's processor
> specific detail...
.
Completely agree with David.

Not speaking about performance but about *style* and expressiveness,
there are some interesting things to note:

 1. No need to explicitly specify recursion in the "keys" aproach.

 2. No need to pass parameters using the "keys" approach-- most of
the work is being done as one atomic operation -- the one-time
creation of the index

 3. Some purists will comment that <for-each-group/> supports the
"more imperative-like", "pull" style of using <xsl:for-each/> as
contrasted with the more general and flexible push-style
<xsl:apply-templates/>

 4. The"keys" approach works without any change both in XSLT 1.0 and XSLT 2.0


Threfore, one might conclude that the "keys" approach can be
implemented in a more compact and flexible way and the resulting
implementations can be more maintainable.

--
Cheers,
Dimitre Novatchev
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