Re: [xsl] [XSLT2] Some common, generic grouping problems

["andrew welch" <andrew.j.welch@xxxxxxxxx>]

On 6/30/06, Christian Roth <roth@xxxxxxxxxxxxxx> wrote:
> andrew welch wrote:
>
> ><root>
> >   <arbitrary />
> >   <elem       color="dark-red" />
> >   <elem       color="red" />
> >   <arbitrary  color="none" />
> >   <elem       color="red" />
> >   <elem       color="light-red" />
> >   <arbitrary />
> >   <elem       color="dark-red" />
> >   <elem       color="red" />
> >   <arbitrary  color="none" />
> >   <elem       color="red" />
> >   <elem       color="light-red" />
> >   <arbitrary />
> ></root>
> [...]
> >That is of course if I've scaled up the input correctly, no comment
> >from the OP so far.
>
> Yes, this is how the input would scale. I'm sorry for not replying
> earlier to the solutions given so far (Andrew, David) - I must admit
> that I am still digesting the code given to extract and understand the
> underlying idea(s).
>
> For your (Andrew's) solution to example #1, am I right that the
> underlying idea could be paraphrased as:
>
> "Group by start, then tail-trim the resulting groups to end (using a
> nested grouping from end)"?

Yes - I would call it "intersecting" rather than "trimming", its
providing the end marker for the group.  The elements that aren't in
the intersect are copied to the result (in the xsl:otherwise blocks)
so trimming might give the wrong impression.