Re: [xsl] Algorithm for determining ranges

["Martin Honnen martin.honnen@xxxxxx" <xsl-list-service@xxxxxxxxxxxxxxxxxxxxxx>]

On 05/06/2026 17:31, rick@xxxxxxxxxxxxxx wrote:
>
> Thank you Martin! I need to unravel the select clause on the grouping;
> there are some concepts I donbt understand.
>
>
> B  B  B  <xsl:for-each-group select="xref" group-adjacent="let $numbers
> := tokenize(., '\.') ! xs:integer(.) return
> string-join(($numbers[position() lt last()], $numbers[last()] -
> position() + 1), '.')">
>

The

 B B let $numbers := tokenize(., '\.') ! xs:integer(.)

breaks up the e.g. 16.2.0 value into a sequence of three integers 16, 2,
0, then the grouping key for each item is computed by maintaining the
leading numbers in that sequence but by computing

 B  B  $numbers[last()] - position() + 1

for the last number, if these form a range that computation will give
the same number for a range and then the string-join just re-assembles
the complete value (for the group-adjacent key).

Of course the

 B  - position() + 1

could also just be

 B  - position()

but I thought it to be more logical to make sure the first item's group
key is the value given in the xref element and not a value where the
last number is decremented.