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
<mailto:wendell(_dot_)piez(_at_)nist(_dot_)gov>
<xsl-list-service(_at_)lists(_dot_)mulberrytech(_dot_)com
<mailto: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
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Cheers,
Dimitre Novatchev
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