Re: [xsl] Re: Seeking an elegant XSLT function to check that a pair of numeric ranges are consecutive

["Dimitre Novatchev dnovatchev@xxxxxxxxx" <xsl-list-service@xxxxxxxxxxxxxxxxxxxxxx>]

> Recall the problem: determine if an integer range has no gaps in it.

This is not the problem you provided to us.

A sequence of overlapping intervals may be connected, but it violates the
requirements for "consecutiveness".

Thanks,
Dimitre

On Sat, May 25, 2024 at 2:02b/PM Roger L Costello costello@xxxxxxxxx <
xsl-list-service@xxxxxxxxxxxxxxxxxxxxxx> wrote:

> Fantastic responses - thank you!
>
> Recall the problem: determine if an integer range has no gaps in it. Till
> now, I have been thinking that the way to solve the problem is to perform a
> series of checks on pairs of ranges. But maybe there is a more general way
> of looking at the problem ...
>
> Recall the XML document:
>
> <Document>
>     <Record>
>         <Range>0-2</Range>
>     </Record>
>     <Record>
>         <Range>3-7</Range>
>     </Record>
>     <Record>
>         <Range>8</Range>
>     </Record>
>     <Record>
>         <Range>9-15</Range>
>     </Record>
> </Document>
>
> If we extract all the ranges, we get this sequence:
>
> (0-2, 3-7, 8, 9-15)
>
> Now the problem may be succinctly restated as:
>
>     Is the sequence connected?
>
> It seems like XSLT should provide a built-in function that evaluates a
> sequence for connectedness and returns true (the sequence is a connected
> sequence) or false (the sequence is not a connected sequence).
>
> Does looking at the problem from the perspective of evaluating the
> connectedness of an entire sequence rather than from the perspective of
> evaluating the connectedness of a pair of ranges ... does that provide
> insight into a different/better way of solving the problem?
>
> As far as I know, XSLT does not provide a built-in function that evaluates
> a sequence (such as the one shown above) for connectedness. If XSLT did
> have such a function, what would be the name of the function?
>
> /Roger