> On 5 Jun 2026, at 17:31, rick@xxxxxxxxxxxxxx
<xsl-list-service@xxxxxxxxxxxxxxxxxxxxxx> wrote:
>
> Thank you Martin! I need to unravel the select clause on the grouping; there
are some concepts I donbt understand.


The basic idea, I think, is to subtract the value of position() from the third
component of the number; after this manipulation, values that form part of a
contiguous range will have the same value.

Michael Kay
Saxonica