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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