Re: Random UUID in pure XSLT?

According to the spec, unparsed-text() is deterministic, which means that two calls with the same argument should return the same result. You're relying on a Saxon non-conformance, I fear!

Except that if you make the call in a loop, Saxon will probably loop-lift it, thus becoming conformant and making your code deliver a stream of identical UUIDs.

You can probably get round it by using unparsed-text("https://uuidgen.org/api/v/4 <https://uuidgen.org/api/v/4>?x=" || position())

Michael Kay
Saxonica

> On 11 Nov 2020, at 18:32, Dimitre Novatchev [email protected] <[email protected]> wrote:
> 
> >  how can I go about producing random UUIDs, in dozens or hundreds, inside an XSLT pipeline, without extension functions in Saxon.
> 
> This is actually very easy and doesn't require the use of any extension functions:
> 
> unparsed-text("https://uuidgen.org/api/v/4 <https://uuidgen.org/api/v/4>")
> 
> or if you need N of them:
> 
> for $i in 1 to $N
>    return  unparsed-text("https://uuidgen.org/api/v/4 <https://uuidgen.org/api/v/4>") 
> 
> 
> 
> 😆
> 
> HTH, Dimitre
> 
> On Tue, Nov 10, 2020 at 8:36 AM Piez, Wendell A. (Fed) [email protected] <mailto:[email protected]> <[email protected] <mailto:[email protected]>> wrote:
> XSL Friends –
> 
>  
> 
> Today I write from the day job, where I am researching the question of how can I go about producing random UUIDs, in dozens or hundreds, inside an XSLT pipeline, without extension functions in Saxon. The Java randomUUID() function works nicely when it’s available, but I need to distribute the capability for SaxonHE and eventually SaxonJS.
> 
>  
> 
> We do not have an available implementation of RFC 4122 v4 “random UUID” in pure XSLT do we, free to use (and study)? I know the functional nature of the language makes randomness, um, problematic (when isn’t it?), which sometimes means workarounds – that’s all fine. Indeed so would calling out to a web service if it is known to be reliable. I have thought about handing a list of UUIDs in at runtime, but as I said, there may sometimes be hundreds and perhaps thousands, which makes that approach seem a bit scary.
> 
>  
> 
> Any thoughts or perspective would be most welcome.
> 
>  
> 
> Thanks, Wendell
> 
>  
> 
>  
> 
>  
> 
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> -- 
> Cheers,
> Dimitre Novatchev
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