Re: [xsl] Random UUID in pure XSLT?

> 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.

Oxygen's XPath/XQuery Builder, when running with XPath 3.1 SA, produces all
different results when evaluating this:

for $i in 1 to 5
   return  unparsed-text("https://uuidgen.org/api/v/4";)

Result:

   ["79ed57c2-14ec-4894-a93f-a6c7ee404000"]

    ["d3644d86-2f36-4ec6-b384-bda1772f508b"]

    ["cf974c15-9658-4f53-9a30-b6f526a8d2d9"]

    ["a1c96481-0d11-4624-a0d8-0d683ce3f8fc"]

    ["f897e396-71c1-4139-b0e7-155833abad43"]

The produced results are all different regardless of which of the following
is used: XPath 2.0, XPath 2.0 SA, XPath 3.1, XPath 3.1 SA, Saxon-HE XQuery
9.9.1.7,  Saxon-PE XQuery 9.9.1.7,  Saxon-EE XQuery 9.9.1.7 .


On Wed, Nov 11, 2020 at 11:19 AM Michael Kay mike(_at_)saxonica(_dot_)com <
xsl-list-service(_at_)lists(_dot_)mulberrytech(_dot_)com> wrote:

> 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 dnovatchev(_at_)gmail(_dot_)com <
> xsl-list-service(_at_)lists(_dot_)mulberrytech(_dot_)com> 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)
> wendell(_dot_)piez(_at_)nist(_dot_)gov 
> <xsl-list-service(_at_)lists(_dot_)mulberrytech(_dot_)com> 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
> >
> >
> >
> >
> >
> >
> > XSL-List info and archive <http://www.mulberrytech.com/xsl/xsl-list>
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> > email)
>
> --
> Cheers,
> Dimitre Novatchev
> ---------------------------------------
> Truly great madness cannot be achieved without significant intelligence.
> ---------------------------------------
> To invent, you need a good imagination and a pile of junk
> -------------------------------------
> Never fight an inanimate object
> -------------------------------------
> To avoid situations in which you might make mistakes may be the
> biggest mistake of all
> ------------------------------------
> Quality means doing it right when no one is looking.
> -------------------------------------
> You've achieved success in your field when you don't know whether what
> you're doing is work or play
> -------------------------------------
> To achieve the impossible dream, try going to sleep.
> -------------------------------------
> Facts do not cease to exist because they are ignored.
> -------------------------------------
> Typing monkeys will write all Shakespeare's works in 200yrs.Will they
> write all patents, too? :)
> -------------------------------------
> Sanity is madness put to good use.
> -------------------------------------
> I finally figured out the only reason to be alive is to enjoy it.
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-- 
Cheers,
Dimitre Novatchev
---------------------------------------
Truly great madness cannot be achieved without significant intelligence.
---------------------------------------
To invent, you need a good imagination and a pile of junk
-------------------------------------
Never fight an inanimate object
-------------------------------------
To avoid situations in which you might make mistakes may be the
biggest mistake of all
------------------------------------
Quality means doing it right when no one is looking.
-------------------------------------
You've achieved success in your field when you don't know whether what
you're doing is work or play
-------------------------------------
To achieve the impossible dream, try going to sleep.
-------------------------------------
Facts do not cease to exist because they are ignored.
-------------------------------------
Typing monkeys will write all Shakespeare's works in 200yrs.Will they write
all patents, too? :)
-------------------------------------
Sanity is madness put to good use.
-------------------------------------
I finally figured out the only reason to be alive is to enjoy it.
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