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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 [email protected] <
[email protected]> 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/random-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 [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] <[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
>> ---------------------------------------
>> 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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>> 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>
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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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