Re: [xsl] Random UUID in pure XSLT?

Subject: Re: [xsl] Random UUID in pure XSLT?
From: "Dimitre Novatchev dnovatchev@xxxxxxxxx" <xsl-list-service@xxxxxxxxxxxxxxxxxxxxxx>
Date: Wed, 11 Nov 2020 21:12:00 -0000
Hi Wendell,

> Meanwhile an XSLT implementation of UUID v4 was not as fearsome as I had
supposed it would be. (We'll see how it stands up.)

I would aim at a pure XPath implementation, XSLT is not interesting
enough p

Thanks,
Dimitre


On Wed, Nov 11, 2020 at 1:06 PM Wendell Piez wapiez@xxxxxxxxxxxxxxx <
xsl-list-service@xxxxxxxxxxxxxxxxxxxxxx> wrote:

> Hi Dimitre,
>
> Yes indeed and I am glad to have all of these in the kit.
>
> This would be a much simpler question if I could guarantee anything about
> the users ... however not only may they be unable to call Java, they might
> also be off line at runtime. So I have to be able to offer options.
>
> Meanwhile an XSLT implementation of UUID v4 was not as fearsome as I had
> supposed it would be. (We'll see how it stands up.)
>
> Thanks again,
> Wendell
>
>
> On Wed, Nov 11, 2020 at 3:35 PM Dimitre Novatchev dnovatchev@xxxxxxxxx <
> xsl-list-service@xxxxxxxxxxxxxxxxxxxxxx> wrote:
>
>> Hi Wendell,
>>
>> Dimitre, suggesting the web service option, offers
>>
>> > for $i in 1 to $N
>> >    return  unparsed-text("https://uuidgen.org/api/v/4";)
>> >
>> > I'll try this ... but what prevents an XSLT engine giving me the same
>> result each time? (Oh I see.)
>>
>> Dr. Kay suggested a fix that will block the deterministic-compliance
>> attempts of a hypothetical XPath 3.0+ (or XSLT 2.0) implementation;
>>
>> for $i in 1 to 100
>>   return unparsed-text(concat("https://uuidgen.org/api/v/4?x=";, $i))
>>
>>
>> I say "hypothetical" above, because even Saxon (the 9.9.1.7 versions used
>> in Oxygen) is non-compliant and produces all-different results for this
>> transformation:
>>
>> <xsl:stylesheet version="3.0"
xmlns:xsl="http://www.w3.org/1999/XSL/Transform";>
>>   <xsl:output method="text"/>
>>
>>   <xsl:template match="/">
>>     <xsl:sequence select=
>>       "for $i in 1 to 100
>>          return unparsed-text('https://uuidgen.org/api/v/4')"/>
>>
>>   </xsl:template></xsl:stylesheet>
>>
>>
>> Interestingly, I have an old version: Saxon 9.1.01, which is compliant to
>> the XSLT 2.0 specification and needs the URL-tail addition in order to get
>> its determinism bypassed.
>>
>> HTH, Dimitre
>>
>>
>> On Wed, Nov 11, 2020 at 12:19 PM Wendell Piez wapiez@xxxxxxxxxxxxxxx <
>> xsl-list-service@xxxxxxxxxxxxxxxxxxxxxx> wrote:
>>
>>> Hi,
>>>
>>> Dimitre, suggesting the web service option, offers
>>>
>>> for $i in 1 to $N
>>>    return  unparsed-text("https://uuidgen.org/api/v/4";)
>>>
>>> I'll try this ... but what prevents an XSLT engine giving me the same
>>> result each time? (Oh I see.)
>>>
>>> Update since yesterday -- I've had some apparent success coding up an
>>> implementation of UUID v4 using fn:random-number-generator() ... results
so
>>> far are here (comments welcome):
>>>
>>>
>>>
https://github.com/wendellpiez/oscal-tools/blob/issue10-uuid-util/xslt/uuid/r
andom-util.xsl
>>>
>>> The functions are deterministic -- they return the same UUID (or UUID
>>> sequence of specified length) for the same seed. In my application, this
is
>>> actually a feature.
>>>
>>> Thanks for all the info and help so far this is great!
>>>
>>> Cheers, Wendell
>>>
>>> On Wed, Nov 11, 2020 at 1:32 PM Dimitre Novatchev dnovatchev@xxxxxxxxx <
>>> xsl-list-service@xxxxxxxxxxxxxxxxxxxxxx> 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>") *
>>>>
>>>>
>>>>
>>>> p
>>>>
>>>> HTH, Dimitre
>>>>
>>>> On Tue, Nov 10, 2020 at 8:36 AM Piez, Wendell A. (Fed)
>>>> wendell.piez@xxxxxxxx <xsl-list-service@xxxxxxxxxxxxxxxxxxxxxx> wrote:
>>>>
>>>>> XSL Friends b
>>>>>
>>>>>
>>>>>
>>>>> 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 itbs available, but I need to distribute
the
>>>>> capability for SaxonHE and eventually SaxonJS.
>>>>>
>>>>>
>>>>>
>>>>> We do not have an available implementation of RFC 4122 v4 brandom
>>>>> UUIDb in pure XSLT do we, free to use (and study)? I know the
functional
>>>>> nature of the language makes randomness, um, problematic (when isnbt
it?),
>>>>> which sometimes means workarounds b thatbs 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>
>>>>> EasyUnsubscribe <http://lists.mulberrytech.com/unsub/xsl-list/782854>
>>>>> (by 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.
>>>>
>>>> XSL-List info and archive <http://www.mulberrytech.com/xsl/xsl-list>
>>>> EasyUnsubscribe <http://lists.mulberrytech.com/unsub/xsl-list/174322>
(by
>>>> email)
>>>>
>>>
>>>
>>> --
>>> ...Wendell Piez... ...wendell -at- nist -dot- gov...
>>> ...wendellpiez.com... ...pellucidliterature.org... ...pausepress.org...
>>> ...github.com/wendellpiez... ...gitlab.coko.foundation/wendell...
>>> XSL-List info and archive <http://www.mulberrytech.com/xsl/xsl-list>
>>> EasyUnsubscribe <http://lists.mulberrytech.com/unsub/xsl-list/782854> (by
>>> 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.
>>
>> XSL-List info and archive <http://www.mulberrytech.com/xsl/xsl-list>
>> EasyUnsubscribe <http://lists.mulberrytech.com/unsub/xsl-list/174322> (by
>> email)
>>
>
>
> --
> ...Wendell Piez... ...wendell -at- nist -dot- gov...
> ...wendellpiez.com... ...pellucidliterature.org... ...pausepress.org...
> ...github.com/wendellpiez... ...gitlab.coko.foundation/wendell...
> XSL-List info and archive <http://www.mulberrytech.com/xsl/xsl-list>
> EasyUnsubscribe <http://lists.mulberrytech.com/unsub/xsl-list/782854> (by
> 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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